@article{DAN_1987_292_5_a1,
     author = {E. G. D'yakonov},
     title = {Iterative methods with saddle operators},
     journal = {Doklady Akademii Nauk},
     pages = {1037--1041},
     publisher = {mathdoc},
     volume = {292},
     number = {5},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_292_5_a1/}
}