@article{UZERU_2006_2_a3,
     author = {A. B. Grigorian},
     title = {Algebraic multigrid preconditioner for elliptic problems with mixed type boundary conditions {II.} {Multigrid} preconditioner},
     journal = {Proceedings of the Yerevan State University. Physical and mathematical sciences},
     pages = {41--48},
     publisher = {mathdoc},
     number = {2},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/UZERU_2006_2_a3/}
}