For citations:
Yusupov A.K., Muselemov Kh.M., Vishtalov R.I. Nonlinear models of beams with variable stiffness. Herald of Dagestan State Technical University. Technical Sciences. 2025;52(2):235-246. (In Russ.) https://doi.org/10.21822/2073-6185-2025-52-2-235-246