Kanca, F., and I. Baglan. “Solution of the Boundary-Value Problem of Heat Conduction With Periodic Boundary Conditions”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 72, no. 2, Feb. 2020, pp. 209-20, https://umj.imath.kiev.ua/index.php/umj/article/view/2367.