@article{10_4153_CJM_1967_108_5,
     author = {Macbeath, A. M.},
     title = {The {Classification} of {Non-Euclidean} {Plane} {Crystallographic} {Groups}},
     journal = {Canadian journal of mathematics},
     pages = {1192--1205},
     year = {1967},
     volume = {19},
     number = {1},
     doi = {10.4153/CJM-1967-108-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-108-5/}
}