@article{DE_1972_8_9_a4,
     author = {Yu. I. Gil'derman and K. N. Kudrina},
     title = {Positive cycles in a system with a limiting factor},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1569--1576},
     publisher = {mathdoc},
     volume = {8},
     number = {9},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_9_a4/}
}