@article{ZNSL_1971_23_a2,
     author = {L. N. Dovbysh and V. N. Sudakov},
     title = {The condition of coordinate system},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {16--32},
     publisher = {mathdoc},
     volume = {23},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1971_23_a2/}
}