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@article{MZM_1989_46_3_a13, author = {Yu. A. Shashkin}, title = {Euler characteristic and multiple coverings}, journal = {Matemati\v{c}eskie zametki}, pages = {110--113}, publisher = {mathdoc}, volume = {46}, number = {3}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1989_46_3_a13/} }
Yu. A. Shashkin. Euler characteristic and multiple coverings. Matematičeskie zametki, Tome 46 (1989) no. 3, pp. 110-113. http://geodesic.mathdoc.fr/item/MZM_1989_46_3_a13/