@article{DAN_1975_224_5_a3,
     author = {M. I. Klyuchantsev},
     title = {On the construction of r-even solutions of singular differential equations},
     journal = {Doklady Akademii Nauk},
     pages = {1004--1007},
     publisher = {mathdoc},
     volume = {224},
     number = {5},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_224_5_a3/}
}