@article{DE_1993_29_6_a3,
     author = {S. A. Brykalov},
     title = {Solutions with a prescribed minimum and maximum},
     journal = {Differencialʹnye uravneni\^a},
     pages = {938--942},
     year = {1993},
     volume = {29},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_6_a3/}
}