@article{DE_1975_11_8_a17,
     author = {I. P. Karklin'},
     title = {Singularity of an orbit that contains a singular point},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1506--1507},
     publisher = {mathdoc},
     volume = {11},
     number = {8},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_8_a17/}
}