@article{IVM_1968_9_a5,
     author = {I. S. Kukles and L. B. Persidskaya},
     title = {On extending {Frommer's} method of investigation of a~singular point to a~system of three differential equations},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {44--54},
     publisher = {mathdoc},
     number = {9},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1968_9_a5/}
}