Grigoryan AB. ALGEBRAIC MULTIGRID PRECONDITIONER FOR ELLIPTIC PROBLEMS WITH MIXED TYPE BOUNDARY CONDITIONS I. TWO-GRID PRECONDITIONERS. Proc. YSU A: Phys. Math. Sci. [Internet]. 2006 Mar. 7 [cited 2024 Nov. 23];40(1 (209):37-48. Available from: https://journals.ysu.am/index.php/proceedings-phys-math/article/view/vol40_no1_2006_pp037-048