Pavlyuk, Y. 2024. Calculation of non-stationary creep deformations of nonlinear viscoelastic materials under the conditions of loading and unloading using the Heaviside function. Bulletin of Taras Shevchenko National University of Kyiv. Physics and Mathematics. 78, 1 (Sep. 2024), 74–77. DOI:https://doi.org/10.17721/1812-5409.2024/1.14.