@article{SM_1973_19_2_a4,
     author = {V. V. Zhikov},
     title = {Monotonicity in the theory of almost periodic solutions of nonlinear operator equations},
     journal = {Sbornik. Mathematics},
     pages = {209--223},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1973_19_2_a4/}
}