@article{DE_1971_7_11_a20,
     author = {N. P. Kovalevskiǐ},
     title = {The solutions of the {Briot} and {Bouquet} equation with constant deviations of the argument in the case of multiple roots of the characteristic equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2099--2102},
     publisher = {mathdoc},
     volume = {7},
     number = {11},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_11_a20/}
}