@article{DAN_1987_294_1_a4,
     author = {R. V. Galiulin and V. A. Efremovich},
     title = {The {Cartesian} characteristic in {Morse} theory},
     journal = {Doklady Akademii Nauk},
     pages = {26--27},
     publisher = {mathdoc},
     volume = {294},
     number = {1},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1987_294_1_a4/}
}