@article{DAN_1976_230_3_a3,
     author = {N. P. Dolbilin},
     title = {Local properties of discrete regular systems},
     journal = {Doklady Akademii Nauk},
     pages = {516--519},
     publisher = {mathdoc},
     volume = {230},
     number = {3},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_3_a3/}
}