@article{DE_1979_15_2_a6,
     author = {V. P. Nozdracheva},
     title = {A congruence function in the vicinity of a structurally stable saddle},
     journal = {Differencialʹnye uravneni\^a},
     pages = {252--261},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1979_15_2_a6/}
}