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@article{IVM_1981_3_a10, author = {V. P. Garit}, title = {Two-dimensional globally discrete groups of symmetry of the {semi-Euclidean} plane}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {72}, publisher = {mathdoc}, number = {3}, year = {1981}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1981_3_a10/} }
V. P. Garit. Two-dimensional globally discrete groups of symmetry of the semi-Euclidean plane. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1981). http://geodesic.mathdoc.fr/item/IVM_1981_3_a10/