@article{IVM_2018_1_a0,
     author = {R. Boukoucha},
     title = {On the non-existence of periodic orbits for a class of two-dimensional {Kolmogorov} systems},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {3--9},
     publisher = {mathdoc},
     number = {1},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2018_1_a0/}
}