Sapagovas, Mifodijus, and Kristina Jakubėlienė. “Alternating Direction Method for Two-Dimensional Parabolic Equation With Nonlocal Integral Condition”. Nonlinear Analysis: Modelling and Control, vol. 17, no. 1, Jan. 2012, pp. 91-98, https://doi.org/10.15388/NA.17.1.14080.