@article{DE_1980_16_5_a15,
     author = {N. E. Bol'shakov and P. P. Potapenko},
     title = {The {Ljapunov} theorem for systems of equations in total differentials},
     journal = {Differencialʹnye uravneni\^a},
     pages = {934--936},
     publisher = {mathdoc},
     volume = {16},
     number = {5},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1980_16_5_a15/}
}