@article{DAN_1996_349_1_a5,
     author = {A. A. Samarskii and P. N. Vabishchevich},
     title = {Iterative cluster aggregation methods for systems of linear},
     journal = {Doklady Akademii Nauk},
     pages = {22--25},
     year = {1996},
     volume = {349},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1996_349_1_a5/}
}