@article{DE_1993_29_12_a14,
     author = {V. I. Prokhorenko},
     title = {On the analyticity of periodic solutions of differential equations with singular {points.~I}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {2168--2177},
     publisher = {mathdoc},
     volume = {29},
     number = {12},
     year = {1993},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1993_29_12_a14/}
}