Z. BARTYNOWSKA-MEUS and A. JUSZKIEWICZ, “Ultrasonic investigations of the relaxation processes related to the presence of the group –C = 0/NH in molecules”, Arch. Acoust., vol. 8, no. 2, pp. 113–118, Mar. 2016, Accessed: Jun. 14, 2025. [Online]. Available: https://acoustics.ippt.pan.pl/index.php/aa/article/view/3248