Geodesic
Sign-sensitive approximations. Problems of uniqueness and
Doklady Akademii Nauk, Tome 333 (1993) no. 1, pp. 5-7 
E. P. Dolzhenko; E. A. Sevast'yanov. Sign-sensitive approximations. Problems of uniqueness and. Doklady Akademii Nauk, Tome 333 (1993) no. 1, pp. 5-7. http://geodesic.mathdoc.fr/item/DAN_1993_333_1_a0/
@article{DAN_1993_333_1_a0,
     author = {E. P. Dolzhenko and E. A. Sevast'yanov},
     title = {Sign-sensitive approximations. {Problems} of uniqueness and},
     journal = {Doklady Akademii Nauk},
     pages = {5--7},
     year = {1993},
     volume = {333},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1993_333_1_a0/}
}
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