@article{ZVMMF_2004_44_9_a0,
     author = {M. V. Gorelova and E. V. Chizhonkov},
     title = {On the preconditioning of saddle problems by means of saddle operators},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1523--1533},
     year = {2004},
     volume = {44},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2004_44_9_a0/}
}