@article{ZVMMF_1974_14_6_a8,
     author = {A. E. Umnov},
     title = {Multi-step linear extrapolation in the method of penalty functions},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1451--1463},
     publisher = {mathdoc},
     volume = {14},
     number = {6},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1974_14_6_a8/}
}