@article{DAN_1989_309_5_a12,
     author = {P. I. Balk},
     title = {The use of a priori information on the topological features of},
     journal = {Doklady Akademii Nauk},
     pages = {1082--1084},
     publisher = {mathdoc},
     volume = {309},
     number = {5},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_5_a12/}
}