@article{DE_1986_22_10_a2,
     author = {I. A. Konovalov and Yu. V. Malyshev and V. P. Zakharov},
     title = {The generalized principle of central symmetry},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1689--1693},
     publisher = {mathdoc},
     volume = {22},
     number = {10},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1986_22_10_a2/}
}