@article{DAN_1990_311_1_a3,
     author = {A. A. Melikyan},
     title = {A positional method for the analysis of singular motions in},
     journal = {Doklady Akademii Nauk},
     pages = {22--26},
     publisher = {mathdoc},
     volume = {311},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_1_a3/}
}