@article{SM_1997_188_9_a0,
     author = {\`E. B. Vinberg},
     title = {Groups defined by periodic paired relations},
     journal = {Sbornik. Mathematics},
     pages = {1269--1278},
     year = {1997},
     volume = {188},
     number = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1997_188_9_a0/}
}