Geodesic
The existence of a “most complex” problem in the class of
Doklady Akademii Nauk, Tome 282 (1985) no. 6, pp. 1299-1303 
A. K. Kel'mans. The existence of a “most complex” problem in the class of. Doklady Akademii Nauk, Tome 282 (1985) no. 6, pp. 1299-1303. http://geodesic.mathdoc.fr/item/DAN_1985_282_6_a2/
@article{DAN_1985_282_6_a2,
     author = {A. K. Kel'mans},
     title = {The existence of a {\textquotedblleft}most complex{\textquotedblright} problem in the class of},
     journal = {Doklady Akademii Nauk},
     pages = {1299--1303},
     year = {1985},
     volume = {282},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_282_6_a2/}
}
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