citatation updated

Ashwin · Ashwin · commit 188dc52a11b4 · 2021-07-26T14:50:58.000+02:00
diff --git a/CITATION.md b/CITATION.md
@@ -1,3 +1,5 @@
+# References
+
 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).

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`@@ -1,3 +1,5 @@`
	`1`	`+# References`
	`2`	`+`
`1`	`3`	`Allard, J. and N. Atalla. "Propagation of Sound in Porous Media: Modelling`
`2`	`4`	`Sound Absorbing Materials", 2nd edition, Wiley, 2009. isbn: 9780470747346.`
`3`	`5`	`doi: [10.1002/9780470747339](https://doi.org//10.1002/9780470747339).`