Hakopian, Y.H. and Hovhannisyan, H.A. 2003. ALGEBRAIC MULTIGRID PRECONDITIONER FOR SECOND ORDER FINITE ELEMENT APPROXIMATIONS IN RECTANGULAR DOMAINS. II. MULTIGRID PRECONDITIONER. Proceedings of the YSU A: Physical and Mathematical Sciences. 37, 2 (201) (Jun. 2003), 18–24. DOI:https://doi.org/10.46991/PYSUA.2003.37.2.018.