@article{SJIM_2003_6_4_a1, author = {R. M. Garipov}, title = {Classification up to isomorphism of crystallographic groups on {a~pseudo-Euclidean} plane. {I.~The} general case}, journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki}, pages = {11--31}, publisher = {mathdoc}, volume = {6}, number = {4}, year = {2003}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/SJIM_2003_6_4_a1/} }