@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/}
}