@article{1256065281,
author = {Rosenberger, Gerhard},
title = {Some remarks on a paper of C. Doyle and D. James on subgroups of $SL(2,\mathbf{R})$},
journal = {Illinois J. Math.},
volume = {28},
number = {4},
year = {1984},
pages = { 348-351},
language = {en},
url = {http://dml.mathdoc.fr/item/1256065281}
}
Rosenberger, Gerhard. Some remarks on a paper of C. Doyle and D. James on subgroups of $SL(2,\mathbf{R})$. Illinois J. Math., Tome 28 (1984) no. 4, pp. 348-351. http://gdmltest.u-ga.fr/item/1256065281/