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@article{MAT_1966_10_3_a4, author = {H. Shimizu}, title = {On discontinuous groups operating on the product of the upper half planes}, journal = {Matematika}, pages = {126--164}, publisher = {mathdoc}, volume = {10}, number = {3}, year = {1966}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MAT_1966_10_3_a4/} }
H. Shimizu. On discontinuous groups operating on the product of the upper half planes. Matematika, Tome 10 (1966) no. 3, pp. 126-164. http://geodesic.mathdoc.fr/item/MAT_1966_10_3_a4/