@article{DE_1971_7_2_a3,
     author = {V. V. Zhikov},
     title = {Certain functional methods in the theory of almost periodic {solutions.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {215--225},
     year = {1971},
     volume = {7},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_2_a3/}
}