A. WINKLER–SKALNA, “Propagation of Soundwaves in Uncertain Environment – New Interval Perturbation Methodology”, Arch. Acoust., vol. 33, no. 4(S), pp. 171–176, Dec. 2008, Accessed: Apr. 26, 2025. [Online]. Available: https://acoustics3.ippt.pan.pl/index.php/aa/article/view/854