@article{MZM_1987_41_5_a1,
     author = {D. S. Dzhumabaev},
     title = {Convergence of iterative methods for unbounded operator equations},
     journal = {Matemati\v{c}eskie zametki},
     pages = {637--645},
     publisher = {mathdoc},
     volume = {41},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1987_41_5_a1/}
}