Dovlet M. Dovletov, “New solvability condition of 2-d nonlocal boundary value problem for Poisson's operator on rectangle”, e-Journal of Analysis and Applied Mathematics, 2021:1 (2021), 12
Dovletov D.M., “Nonlocal Boundary Value Problem With Poisson'S Operator on a Rectangle and Its Difference Interpretation”, Bull. Karaganda Univ-Math., 99:3 (2020), 38–54
Dosiyev A.A., “Difference Method of Fourth Order Accuracy For the Laplace Equation With Multilevel Nonlocal Conditions”, J. Comput. Appl. Math., 354 (2019), 587–596
Dosiyev A. Reis R., “A Fourth-Order Accurate Difference Dirichlet Problem For the Approximate Solution of Laplace'S Equation With Integral Boundary Condition”, Adv. Differ. Equ., 2019:1 (2019), 340
Ad{\i}güzel A. Dosiyev, Rifat Reis, C. Cattani, A. Atangana, H. Bulut, Z. Hammouch, H.M. Baskonus, T. Mekkaoui, S. Agoujil, “An Approximate Grid Solution of a Nonlocal Boundary Value Problem with Integral Boundary Condition for Laplace's Equation”, ITM Web Conf., 22 (2018), 01016
Volkov E.A. Dosiyev A.A., “On the Numerical Solution of a Multilevel Nonlocal Problem”, Mediterr. J. Math., 13:5 (2016), 3589–3604