@article{DE_2002_38_3_a0,
     author = {V. I. Borzdyko},
     title = {The {Existence} of a {Positive} {Periodic} {Solution} of the {Wangersky--Cunningham} {Predator-Prey} {System} {Allowing} for {Periodic} {Changes} in the {Environment}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {291--297},
     publisher = {mathdoc},
     volume = {38},
     number = {3},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2002_38_3_a0/}
}