Lavcel-Budko, Olga, and Aleksandras Krylovas. “Conditions of Resonance Interaction of Acoustic Periodic Waves Interaction”. Lietuvos matematikos rinkinys 55, no. B (December 20, 2014): 72–77. Accessed April 29, 2024. https://www.journals.vu.lt/LMR/article/view/17212.