Pavlenko, V. N., and M. S. Fedyashev. “Periodic Solutions of a Parabolic Equation With Homogeneous Dirichlet Boundary Condition and Linearly Increasing Discontinuous Nonlinearity”. Ukrains’kyi Matematychnyi Zhurnal 64, no. 8 (August 25, 2012): 1080-1088. Accessed March 28, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2642.