Krylovas, Aleksandras, and Paulius Miškinis. “Nonlinear Oscillations of the Absolute Elastic Weightless String. Asymptotics Construction”. Lietuvos matematikos rinkinys 47, no. spec. (September 21, 2007): 123–127. Accessed October 29, 2026. https://zurnalai.vu.lt/LMR/article/view/19766.