@article{DE_1978_14_2_a5,
     author = {S. Yu. Pilyugin},
     title = {Phase diagrams that determine {Morse--Smale} systems without periodic trajectories on spheres},
     journal = {Differencialʹnye uravneni\^a},
     pages = {245--254},
     publisher = {mathdoc},
     volume = {14},
     number = {2},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_2_a5/}
}