@article{SJIM_2004_7_1_a2,
     author = {R. M. Garipov},
     title = {Classification up to isomorphism of crystallographic groups on {a~pseudo-Euclidean} plane. {II.~Lattices~}$*$. {Series~VII,~VIII}},
     journal = {Sibirskij \v{z}urnal industrialʹnoj matematiki},
     pages = {21--38},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2004},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/SJIM_2004_7_1_a2/}
}