Pairs of real $2$-by-$2$ matrices that generate free products.
Lyndon, R. C. ; Ullman, J. L.
Michigan Math. J., Tome 15 (1968) no. 1, p. 161-166 / Harvested from Project Euclid
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Publié le : 1968-06-14
Classification:  20.65 
@article{1028999969,
     author = {Lyndon, R. C. and Ullman, J. L.},
     title = {Pairs of real $2$-by-$2$ matrices that generate free products.},
     journal = {Michigan Math. J.},
     volume = {15},
     number = {1},
     year = {1968},
     pages = { 161-166},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1028999969}
}

Lyndon, R. C.; Ullman, J. L. Pairs of real $2$-by-$2$ matrices that generate free products.. Michigan Math. J., Tome 15 (1968) no. 1, pp.  161-166. http://gdmltest.u-ga.fr/item/1028999969/