Geodesic
On a problem of Ulam
Doklady Akademii Nauk, Tome 255 (1980) no. 6, pp. 1292-1295 
N. A. Bobylev. On a problem of Ulam. Doklady Akademii Nauk, Tome 255 (1980) no. 6, pp. 1292-1295. http://geodesic.mathdoc.fr/item/DAN_1980_255_6_a1/
@article{DAN_1980_255_6_a1,
     author = {N. A. Bobylev},
     title = {On a problem of {Ulam}},
     journal = {Doklady Akademii Nauk},
     pages = {1292--1295},
     year = {1980},
     volume = {255},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_255_6_a1/}
}
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