WINKLER–SKALNA, Agnieszka. “Propagation of Soundwaves in Uncertain Environment – New Interval Perturbation Methodology”. Archives of Acoustics 33, no. 4(S) (January 31, 2008): 171–176. Accessed April 18, 2026. http://acoustics.ippt.gov.pl/index.php/aa/article/view/854.