@article{1195510654,
author = {Takebayashi, Tadayoshi},
title = {Relations of the Weyl groups of extended affine root systems $A\_1 ^{\left( {1,1} \right)} ,B\_1 ^{\left( {1,1} \right)} ,C\_1 ^{\left( {1,1} \right)} ,D\_1 ^{\left( {1,1} \right)}$},
journal = {Proc. Japan Acad. Ser. A Math. Sci.},
volume = {71},
number = {10},
year = {1995},
pages = { 123-124},
language = {en},
url = {http://dml.mathdoc.fr/item/1195510654}
}
Takebayashi, Tadayoshi. Relations of the Weyl groups of extended affine root systems $A_1 ^{\left( {1,1} \right)} ,B_1 ^{\left( {1,1} \right)} ,C_1 ^{\left( {1,1} \right)} ,D_1 ^{\left( {1,1} \right)}$. Proc. Japan Acad. Ser. A Math. Sci., Tome 71 (1995) no. 10, pp. 123-124. http://gdmltest.u-ga.fr/item/1195510654/