@article{TRSPY_2002_239_a18,
     author = {W. Plesken and O. Heidb\"uchel},
     title = {The {Graph} of {a~Geometric} {Class} of {Space} {Groups}},
     journal = {Informatics and Automation},
     pages = {284--288},
     publisher = {mathdoc},
     volume = {239},
     year = {2002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_2002_239_a18/}
}