@article{MZM_1995_58_5_a13,
     author = {S. Yu. Sadov},
     title = {Normal form of the satellite oscillation equation in the singular case},
     journal = {Matemati\v{c}eskie zametki},
     pages = {785--789},
     publisher = {mathdoc},
     volume = {58},
     number = {5},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1995_58_5_a13/}
}