@article{IVM_1959_1_a10,
     author = {S. A. Markosyan},
     title = {Qualitative investigation of a system of two differential equations by the method of two isoclines},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {114--128},
     publisher = {mathdoc},
     number = {1},
     year = {1959},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1959_1_a10/}
}