citatation updated

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+# References
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 Allard, J. and N. Atalla. "Propagation of Sound in Porous Media: Modelling 
 Sound Absorbing Materials", 2nd edition, Wiley, 2009. isbn: 9780470747346. 
 doi: [10.1002/9780470747339](https://doi.org//10.1002/9780470747339).