Geodesic
Phase diagrams that determine Morse–Smale systems without periodic trajectories on spheres
Differencialʹnye uravneniâ, Tome 14 (1978) no. 2, pp. 245-254 
S. Yu. Pilyugin. Phase diagrams that determine Morse–Smale systems without periodic trajectories on spheres. Differencialʹnye uravneniâ, Tome 14 (1978) no. 2, pp. 245-254. http://geodesic.mathdoc.fr/item/DE_1978_14_2_a5/
@article{DE_1978_14_2_a5,
     author = {S. Yu. Pilyugin},
     title = {Phase diagrams that determine {Morse{\textendash}Smale} systems without periodic trajectories on spheres},
     journal = {Differencialʹnye uravneni\^a},
     pages = {245--254},
     year = {1978},
     volume = {14},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_2_a5/}
}
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