@article{DE_1991_27_3_a7,
     author = {V. G. Il'ichev},
     title = {Fragment of a mathematical theory of competition among biological species in a variable environment},
     journal = {Differencialʹnye uravneni\^a},
     pages = {437--447},
     publisher = {mathdoc},
     volume = {27},
     number = {3},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_3_a7/}
}