Add DOIs for all JOSS paper references.

paper.bib

@@ -5,6 +5,7 @@ @article{2012_optimal_stability_polynomials
 	Pages = {247--271},
 	Title = {Optimal stability polynomials for numerical integration of initial value problems},
 	Volume = {7},
+    doi = {10.2140/camcos.2012.7.247},
 	Year = {2012}
 }
 
@@ -17,6 +18,7 @@ @article{2009_monotonicity
 	Pages = {1497--1513},
 	Title = {{Computation of optimal monotonicity preserving general linear methods}},
 	Volume = {78},
+    doi = {10.1090/S0025-5718-09-02209-1},
 	Year = {2009}}
 
 
@@ -45,6 +47,7 @@ @article{2013_sd_erk
 	Pages = {A957-A986},
 	Title = {Optimized explicit {R}unge-{K}utta schemes for the spectral difference method applied to wave propagation problems},
 	Volume = {35},
+    doi = {10.1137/120885899},
 	Year = {2013}}
 
 @article{2014_ssp_rkdg,
@@ -54,6 +57,7 @@ @article{2014_ssp_rkdg
 	Pages = {313-344},
 	Title = {Optimal strong-stability-preserving {R}unge--{K}utta time discretizations for discontinuous {G}alerkin methods},
 	Volume = {60},
+    doi = {10.1007/s10915-013-9796-7},
 	Year = {2014}}
 
 @article{conde2017implicit,
@@ -64,6 +68,7 @@ @article{conde2017implicit
   number={2-3},
   pages={667--690},
   year={2017},
+  doi = {10.1007/s10915-017-0560-2},
   publisher={Springer}
 }
 
@@ -83,6 +88,7 @@ @article{christlieb2016explicit
   number={3},
   pages={914--942},
   year={2016},
+  doi={10.1007/s10915-016-0195-8},
   publisher={Springer}
 }
 
@@ -93,6 +99,7 @@ @article{gottlieb2015optimal
   volume={84},
   number={296},
   pages={2743--2761},
+  doi={10.1007/s10915-016-0195-8},
   year={2015}
 }
 
@@ -104,6 +111,7 @@ @article{grant2019strong
   number={1},
   pages={21--59},
   year={2019},
+  doi={10.1007/s10915-016-0195-8},
   publisher={Springer}
 }
 
@@ -115,6 +123,7 @@ @inproceedings{reynoso2017strong
   number={1},
   pages={560068},
   year={2017},
+  doi={10.1063/1.4992751},
   organization={AIP Publishing LLC}
 }
 
@@ -147,6 +156,7 @@ @article{2008_explicit_ssp
 	Pages = {2113--2136},
 	Title = {Highly Efficient Strong Stability Preserving {R}unge-{K}utta Methods with Low-Storage Implementations},
 	Volume = {30},
+    doi = {10.1137/07070485X},
 	Year = {2008}}
 
 
@@ -158,6 +168,7 @@ @article{2009_implicit_ssp
 	Pages = {373--392},
 	Title = {{Optimal implicit strong stability preserving {R}unge--{K}utta methods}},
 	Volume = {59},
+    doi = {10.1016/j.apnum.2008.03.034},
 	Year = {2009}}
 
 
@@ -169,6 +180,7 @@ @article{2010_LSRK
 	Pages = {1763--1773},
 	Title = {{R}unge--{K}utta methods with minimum storage implementations},
 	Volume = {229},
+    doi = {10.1016/j.jcp.2009.11.006},
 	Year = {2010}}
 
 
@@ -180,6 +192,7 @@ @article{2011_dwssp
 	Pages = {1649},
 	Title = {Step Sizes for Strong Stability Preservation with Downwind-Biased Operators},
 	Volume = {49},
+    doi = {10.1137/100818674},
 	Year = {2011}}
 
 
@@ -191,6 +204,7 @@ @article{2011_tsrk
 	Pages = {2618-2639},
 	Title = {Strong Stability Preserving Two-step {R}unge--{K}utta Methods},
 	Volume = {49},
+    doi = {10.1137/10080960X},
 	Year = {2011}}
 
 
@@ -200,6 +214,7 @@ @article{2017_msrk
 	Pages = {747-769},
 	Title = {Strong Stability Preserving Multistep {R}unge-{K}utta Methods},
 	Volume = {86},
+    doi = {10.1090/mcom/3115},
 	Year = {2017}}
 
 @article{2018_perturbations,
@@ -211,7 +226,7 @@ @article{2018_perturbations
   pages={1337--1369},
   year={2018},
   publisher={Springer},
-	doi={10.1007/s10915-018-0664-3}
+  doi={10.1007/s10915-018-0664-3}
 }
 
 @article{conde2018embedded,
@@ -260,6 +275,7 @@ @incollection{gb08
   publisher = {Springer-Verlag Limited},
   pages     = {95--110},
   year      = 2008,
+  doi = {10.1007/978-1-84800-155-8_7},
   url      = {http://stanford.edu/~boyd/graph_dcp.html}
 }
 
@@ -292,5 +308,6 @@ @Article{higueras2019strong
  Publisher = {Springer US, New York, NY},
  Language = {English},
  MSC2010 = {65L05 65L06 65L20 65M20},
- Zbl = {1416.65193}
+ Zbl = {1416.65193},
+ doi = {10.1007/s10915-019-00916-3}
 }