@article{DAN_1990_315_5_a6,
     author = {R. B. Statnikov and Yu. Yu. Uzvolok},
     title = {The determination of the boundaries of variation of parameters in},
     journal = {Doklady Akademii Nauk},
     pages = {1057--1061},
     publisher = {mathdoc},
     volume = {315},
     number = {5},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_315_5_a6/}
}