@article{DE_1972_8_10_a24,
     author = {S. N. Olekhnik},
     title = {The boundedness and unboundedness of the solutions of certain systems of second order equations},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1894--1897},
     publisher = {mathdoc},
     volume = {8},
     number = {10},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1972_8_10_a24/}
}