@article{1183420083,
author = {Miller, G. A.},
title = {On the groups generated by two operators satisfying the condition $s\_1 s\_2 = s\_2^{ - 2} s\_1^{ - 2}$},
journal = {Bull. Amer. Math. Soc.},
volume = {16},
number = {3},
year = {1909},
pages = { 162-165},
language = {en},
url = {http://dml.mathdoc.fr/item/1183420083}
}
Miller, G. A. On the groups generated by two operators satisfying the condition $s_1 s_2 = s_2^{ - 2} s_1^{ - 2}$. Bull. Amer. Math. Soc., Tome 16 (1909) no. 3, pp. 162-165. http://gdmltest.u-ga.fr/item/1183420083/