Geodesic
On planar surfaces
Doklady Akademii Nauk, Tome 219 (1974) no. 1, pp. 19-22 
R. M. Geidel'man; L. Z. Kruglyakov. On planar surfaces. Doklady Akademii Nauk, Tome 219 (1974) no. 1, pp. 19-22. http://geodesic.mathdoc.fr/item/DAN_1974_219_1_a2/
@article{DAN_1974_219_1_a2,
     author = {R. M. Geidel'man and L. Z. Kruglyakov},
     title = {On planar surfaces},
     journal = {Doklady Akademii Nauk},
     pages = {19--22},
     year = {1974},
     volume = {219},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_219_1_a2/}
}
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