An asymptotic result for subgroups of $SL(2,Z)$ of level 2
Newman, Morris
Illinois J. Math., Tome 32 (1988) no. 4, p. 584-591 / Harvested from Project Euclid
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Publié le : 1988-09-15
Classification:  11F06,  20H05 
@article{1255989008,
     author = {Newman, Morris},
     title = {An asymptotic result for subgroups of $SL(2,Z)$ of level 2},
     journal = {Illinois J. Math.},
     volume = {32},
     number = {4},
     year = {1988},
     pages = { 584-591},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1255989008}
}

Newman, Morris. An asymptotic result for subgroups of $SL(2,Z)$ of level 2. Illinois J. Math., Tome 32 (1988) no. 4, pp.  584-591. http://gdmltest.u-ga.fr/item/1255989008/