diff --git a/README.md b/README.md
index 3b31253..df583c1 100644
--- a/README.md
+++ b/README.md
@@ -26,9 +26,12 @@ If you want to filter by more than one value, simply concatenate all the desired
 ```python
 from aempsconn.aemps import AempsConn
 from aempsconn.filter import (
+    MaterialFilter,
     MedicamentoFilter,
     MedicamentosFilter,
+    NotaFilter,
     PresentacionesFilter,
+    RegistroCambiosFilter,
     VmppFilter,
 )
 
@@ -44,6 +47,11 @@ for med in aemps.medicamentos.get(
 ):
     print(med.nombre)
 
+for med in aemps.medicamentos.get(
+    filter=MedicamentosFilter().nombre.startswith(value="")
+):
+    print(med.nombre)
+
 for med in aemps.presentaciones.get(
     filter=PresentacionesFilter().vmp.equals("270671000140106")
 ):
@@ -52,6 +60,19 @@ for med in aemps.presentaciones.get(
 for desc_cli in aemps.vmpp.get(filter=VmppFilter().nombre.contains("metotrexato")):
     print(desc_cli.vmpDesc)
 
+for change in aemps.registro_cambios.get(
+    filter=RegistroCambiosFilter().fecha.equals(value="20/12/2023")
+):
+    print(change)
+
+for note in aemps.notas.get(filter=NotaFilter().nregistro.equals("69223")):
+    print(note)
+
+for material in aemps.materiales.get(
+    filter=MaterialFilter().nregistro.equals("78632")
+):
+    print(material)
+
 ```
 
 ## Contributing
diff --git a/pyproject.toml b/pyproject.toml
index c78056e..2a15007 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "aempsconn"
-version = "1.0.1"
+version = "1.0.2"
 description = "Library designed for interacting with the CIMA API (AEMPS)"
 license = "MIT"
 authors = ["fqlenos <fqlenos@protonmail.com>"]
diff --git a/src/aempsconn/aemps.py b/src/aempsconn/aemps.py
index 0121709..715e8c0 100644
--- a/src/aempsconn/aemps.py
+++ b/src/aempsconn/aemps.py
@@ -4,7 +4,15 @@
 
 from pydantic import HttpUrl
 
-from .modules import Medicamento, Medicamentos, Presentaciones, Vmpp
+from .modules import (
+    Material,
+    Medicamento,
+    Medicamentos,
+    Notas,
+    Presentaciones,
+    RegistroCambios,
+    Vmpp,
+)
 from .utils.request_handler import ReqHandler
 
 
@@ -46,3 +54,15 @@ def presentaciones(self) -> Presentaciones:
     @property
     def vmpp(self) -> Vmpp:
         return Vmpp(req_handler=self.__req_handler)
+
+    @property
+    def registro_cambios(self) -> RegistroCambios:
+        return RegistroCambios(req_handler=self.__req_handler)
+
+    @property
+    def notas(self) -> Notas:
+        return Notas(req_handler=self.__req_handler)
+
+    @property
+    def materiales(self) -> Material:
+        return Material(req_handler=self.__req_handler)
diff --git a/src/aempsconn/filter/__init__.py b/src/aempsconn/filter/__init__.py
index ffd0c02..5e008bf 100644
--- a/src/aempsconn/filter/__init__.py
+++ b/src/aempsconn/filter/__init__.py
@@ -1,7 +1,10 @@
 """Package: Filters for different modules."""
 
 from .maestras import MaestrasFilter
+from .material import MaterialFilter
 from .medicamento import MedicamentoFilter
 from .medicamentos import MedicamentosFilter
+from .nota import NotaFilter
 from .presentaciones import PresentacionesFilter
+from .registro_cambios import RegistroCambiosFilter
 from .vmpp import VmppFilter
diff --git a/src/aempsconn/filter/material.py b/src/aempsconn/filter/material.py
new file mode 100644
index 0000000..a3a59f4
--- /dev/null
+++ b/src/aempsconn/filter/material.py
@@ -0,0 +1,19 @@
+"""Module for filtering the 'Materiales'."""
+
+from ..utils.filter import Filterable, Text
+
+
+class NumRegistro(Text["MaterialFilter"]):
+    def __init__(self, instance: "MaterialFilter") -> None:
+        key: str = "nregistro"
+        super().__init__(key=key, instance=instance)
+
+
+class MaterialFilter(Filterable):
+
+    def __init__(self) -> None:
+        super().__init__()
+
+    @property
+    def nregistro(self) -> "NumRegistro":
+        return NumRegistro(instance=self)
diff --git a/src/aempsconn/filter/nota.py b/src/aempsconn/filter/nota.py
new file mode 100644
index 0000000..e45c6de
--- /dev/null
+++ b/src/aempsconn/filter/nota.py
@@ -0,0 +1,19 @@
+"""Module for filtering the 'Notas'."""
+
+from ..utils.filter import Filterable, Text
+
+
+class NumRegistro(Text["NotaFilter"]):
+    def __init__(self, instance: "NotaFilter") -> None:
+        key: str = "nregistro"
+        super().__init__(key=key, instance=instance)
+
+
+class NotaFilter(Filterable):
+
+    def __init__(self) -> None:
+        super().__init__()
+
+    @property
+    def nregistro(self) -> "NumRegistro":
+        return NumRegistro(instance=self)
diff --git a/src/aempsconn/filter/registro_cambios.py b/src/aempsconn/filter/registro_cambios.py
new file mode 100644
index 0000000..9afb8ae
--- /dev/null
+++ b/src/aempsconn/filter/registro_cambios.py
@@ -0,0 +1,39 @@
+"""Module for filtering the 'Registro Cambios'."""
+
+from ..utils.filter import Date, Filterable, Integer, Text
+
+
+class Fecha(Date["RegistroCambiosFilter"]):
+    def __init__(self, instance: "RegistroCambiosFilter") -> None:
+        key: str = "fecha"
+        super().__init__(key=key, instance=instance)
+
+
+class NumRegistro(Text["RegistroCambiosFilter"]):
+    def __init__(self, instance: "RegistroCambiosFilter") -> None:
+        key: str = "nregistro"
+        super().__init__(key=key, instance=instance)
+
+
+class Pagina(Integer["RegistroCambiosFilter"]):
+    def __init__(self, instance: "RegistroCambiosFilter") -> None:
+        key: str = "pagina"
+        super().__init__(key=key, instance=instance)
+
+
+class RegistroCambiosFilter(Filterable):
+
+    def __init__(self) -> None:
+        super().__init__()
+
+    @property
+    def fecha(self) -> "Fecha":
+        return Fecha(instance=self)
+
+    @property
+    def nregistro(self) -> "NumRegistro":
+        return NumRegistro(instance=self)
+
+    @property
+    def pagina(self) -> "Pagina":
+        return Pagina(instance=self)
diff --git a/src/aempsconn/modules/__init__.py b/src/aempsconn/modules/__init__.py
index 9bd28cd..d8fd42d 100644
--- a/src/aempsconn/modules/__init__.py
+++ b/src/aempsconn/modules/__init__.py
@@ -1,6 +1,9 @@
 """Package: CIMA-related modules."""
 
+from .material import Material
 from .medicamento import Medicamento
 from .medicamentos import Medicamentos
+from .notas import Notas
 from .presentaciones import Presentaciones
+from .registro_cambios import RegistroCambios
 from .vmpp import Vmpp
diff --git a/src/aempsconn/modules/material.py b/src/aempsconn/modules/material.py
new file mode 100644
index 0000000..b8ad508
--- /dev/null
+++ b/src/aempsconn/modules/material.py
@@ -0,0 +1,21 @@
+"""Module for retrieving information from 'Materiales' endpoint."""
+
+from typing import Any
+
+from ..filter.material import MaterialFilter
+from ..objects.material import MaterialModel
+from ..utils.module import BaseModule
+from ..utils.request_handler import ReqHandler
+
+
+class Material(BaseModule[MaterialFilter, MaterialModel]):
+
+    def __init__(self, req_handler: ReqHandler) -> None:
+        super().__init__(req_handler)
+
+    @property
+    def endpoint(self) -> str:
+        return "materiales"
+
+    def parse_result(self, data: dict[str, Any]) -> MaterialModel:
+        return MaterialModel(**data)
diff --git a/src/aempsconn/modules/notas.py b/src/aempsconn/modules/notas.py
new file mode 100644
index 0000000..2bbbf55
--- /dev/null
+++ b/src/aempsconn/modules/notas.py
@@ -0,0 +1,21 @@
+"""Module for retrieving information from 'Notas' endpoint."""
+
+from typing import Any
+
+from ..filter.nota import NotaFilter
+from ..objects.nota import NotaModel
+from ..utils.module import BaseModule
+from ..utils.request_handler import ReqHandler
+
+
+class Notas(BaseModule[NotaFilter, NotaModel]):
+
+    def __init__(self, req_handler: ReqHandler) -> None:
+        super().__init__(req_handler)
+
+    @property
+    def endpoint(self) -> str:
+        return "notas"
+
+    def parse_result(self, data: list[dict[str, Any]]) -> list[NotaModel]:
+        return [NotaModel(**d) for d in data]
diff --git a/src/aempsconn/modules/registro_cambios.py b/src/aempsconn/modules/registro_cambios.py
new file mode 100644
index 0000000..3ef51e6
--- /dev/null
+++ b/src/aempsconn/modules/registro_cambios.py
@@ -0,0 +1,23 @@
+"""Module for retrieving information from 'Registro Cambios' endpoint."""
+
+from typing import Any
+
+from ..filter.registro_cambios import RegistroCambiosFilter
+from ..objects.registro_cambios import RegistroCambiosModel
+from ..utils.module import BaseModule
+from ..utils.request_handler import ReqHandler
+
+
+class RegistroCambios(BaseModule[RegistroCambiosFilter, RegistroCambiosModel]):
+
+    def __init__(self, req_handler: ReqHandler) -> None:
+        super().__init__(req_handler)
+
+    @property
+    def endpoint(self) -> str:
+        return "registroCambios"
+
+    def parse_result(self, data: dict[str, Any]) -> RegistroCambiosModel:
+        if "Es necesario indicar la fecha" in data.values():
+            raise KeyError("You must filter, at least, by `fecha`")
+        return RegistroCambiosModel(**data)
diff --git a/src/aempsconn/objects/documento.py b/src/aempsconn/objects/documento.py
index 682a6e9..888a3f2 100644
--- a/src/aempsconn/objects/documento.py
+++ b/src/aempsconn/objects/documento.py
@@ -2,22 +2,14 @@
 
 from datetime import datetime
 
-from pydantic import HttpUrl, field_validator
+from pydantic import Field, HttpUrl
 from pydantic.dataclasses import dataclass
 
 
 @dataclass
 class DocumentoModel:
-    tipo: int
     secc: bool
+    tipo: int = Field(ge=1, le=4)
     url: HttpUrl | None = None
     urlHtml: HttpUrl | None = None
     fecha: datetime | None = None
-
-    @field_validator("tipo")
-    @classmethod
-    def check_tipo_range(cls, tipo: int) -> int:
-        if tipo not in range(1, 5):
-            raise ValueError("'Tipo' field must be between 1-4 (both included)")
-
-        return tipo
diff --git a/src/aempsconn/objects/material.py b/src/aempsconn/objects/material.py
index afdc477..f26cff6 100644
--- a/src/aempsconn/objects/material.py
+++ b/src/aempsconn/objects/material.py
@@ -1,14 +1,14 @@
 """Module for the 'Material' object."""
 
-from pydantic import HttpUrl
 from pydantic.dataclasses import dataclass
 
 from .documento_material import DocumentoMaterialModel
+from .videos import VideoModel
 
 
 @dataclass
 class MaterialModel:
-    titulo: str
-    listaDocsPaciente: list[DocumentoMaterialModel]
-    listaDocsProfesional: list[DocumentoMaterialModel]
-    video: HttpUrl
+    titulo: str | None = None
+    listaDocsPaciente: list[DocumentoMaterialModel] | None = None
+    listaDocsProfesional: list[DocumentoMaterialModel] | None = None
+    videos: list[VideoModel] | None = None
diff --git a/src/aempsconn/objects/nota.py b/src/aempsconn/objects/nota.py
index 3d56090..ac3a552 100644
--- a/src/aempsconn/objects/nota.py
+++ b/src/aempsconn/objects/nota.py
@@ -10,7 +10,7 @@
 class NotaModel:
     tipo: int
     num: str
-    ref: str
+    referencia: str
     asunto: str
     fecha: datetime
     url: HttpUrl
diff --git a/src/aempsconn/objects/registro_cambios.py b/src/aempsconn/objects/registro_cambios.py
index a8a0ce9..9a1d8d8 100644
--- a/src/aempsconn/objects/registro_cambios.py
+++ b/src/aempsconn/objects/registro_cambios.py
@@ -3,7 +3,7 @@
 from datetime import datetime
 from typing import Literal
 
-from pydantic import field_validator
+from pydantic import Field
 from pydantic.dataclasses import dataclass
 
 
@@ -11,8 +11,7 @@
 class RegistroCambiosModel:
     nregistro: str
     fecha: datetime
-    tipoCambio: int
-    cambios: list[
+    cambio: list[
         Literal[
             "estado",
             "comerc",
@@ -22,13 +21,7 @@ class RegistroCambiosModel:
             "notasSeguridad",
             "matinf",
             "otros",
+            "fotos",
         ]
     ]
-
-    @field_validator("tipoCambio")
-    @classmethod
-    def check_tipo_cambio_range(cls, tipo_cambio: int) -> int:
-        if tipo_cambio not in range(1, 4):
-            raise ValueError("'TipoCambio' field must be between 1-4 (both included)")
-
-        return tipo_cambio
+    tipoCambio: int = Field(ge=1, le=4)
diff --git a/src/aempsconn/objects/videos.py b/src/aempsconn/objects/videos.py
new file mode 100644
index 0000000..247ff59
--- /dev/null
+++ b/src/aempsconn/objects/videos.py
@@ -0,0 +1,14 @@
+"""Module for the 'Videos' object."""
+
+from datetime import datetime
+
+from pydantic import HttpUrl
+from pydantic.dataclasses import dataclass
+
+
+@dataclass
+class VideoModel:
+    titulo: str
+    url: HttpUrl
+    video: HttpUrl
+    fecha: datetime
diff --git a/src/aempsconn/utils/__init__.py b/src/aempsconn/utils/__init__.py
deleted file mode 100644
index 19f917f..0000000
--- a/src/aempsconn/utils/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-"""Package: General utils for the AEMPSconn."""
diff --git a/src/aempsconn/utils/filter/__init__.py b/src/aempsconn/utils/filter/__init__.py
index 584a770..51b4035 100644
--- a/src/aempsconn/utils/filter/__init__.py
+++ b/src/aempsconn/utils/filter/__init__.py
@@ -1,4 +1,4 @@
 """Package: Utils of the filtering methods for AEMPSconn."""
 
 from .filter import Filterable
-from .operator import Bool, Integer, Text
+from .operator import Bool, Date, Integer, Text
diff --git a/src/aempsconn/utils/filter/base_operator.py b/src/aempsconn/utils/filter/base_operator.py
index e090270..1a835e2 100644
--- a/src/aempsconn/utils/filter/base_operator.py
+++ b/src/aempsconn/utils/filter/base_operator.py
@@ -1,5 +1,6 @@
 """Module for the base operators of the filtering."""
 
+from datetime import datetime
 from typing import Generic, TypeVar
 
 from .filter import Filter, Filterable
@@ -21,6 +22,10 @@ def __init__(
 
 class Equals(BaseOperator[T, R], Generic[T, R]):
     def equals(self, value: T) -> R:
+        if self.key == "fecha":
+            # checks datetime format and raises a value error if needed
+            datetime.strptime(str(value), "%d/%m/%Y").strftime("%d/%m/%Y")
+
         self.instance.query.append(Filter(key=self.key, value=value))
         return self.instance
 
diff --git a/src/aempsconn/utils/filter/operator.py b/src/aempsconn/utils/filter/operator.py
index c8e2ded..62562bc 100644
--- a/src/aempsconn/utils/filter/operator.py
+++ b/src/aempsconn/utils/filter/operator.py
@@ -26,3 +26,10 @@ class Integer(
     Generic[R],
 ):
     pass
+
+
+class Date(
+    Equals[str, R],
+    Generic[R],
+):
+    pass
diff --git a/src/aempsconn/utils/request_handler.py b/src/aempsconn/utils/request_handler.py
index be7a885..1daa951 100644
--- a/src/aempsconn/utils/request_handler.py
+++ b/src/aempsconn/utils/request_handler.py
@@ -115,6 +115,12 @@ def _request(
         initial_response: dict[str, Any] = self._raw_request(
             method=method, endpoint=endpoint, params=params, **kwargs
         )
+
+        if isinstance(initial_response, list):
+            # When requesting "notas", AEMPS returns a list
+            yield initial_response
+            return
+
         if initial_response.get(RESULTS, None) is None:
             yield initial_response