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@article{MZM_1983_33_3_a13, author = {S. I. Khashin}, title = {The irregularity of double surfaces}, journal = {Matemati\v{c}eskie zametki}, pages = {459--462}, publisher = {mathdoc}, volume = {33}, number = {3}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MZM_1983_33_3_a13/} }
S. I. Khashin. The irregularity of double surfaces. Matematičeskie zametki, Tome 33 (1983) no. 3, pp. 459-462. http://geodesic.mathdoc.fr/item/MZM_1983_33_3_a13/