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@article{MS2_1997__80_2_167419, author = {Bilal Vatansever}, title = {Efficient presentations of the group {PSL(2,} {Z...)} x {PSL(2,} {Z...),} for certain n, m.}, journal = {Mathematica Scandinavica}, pages = {188--194}, publisher = {mathdoc}, volume = {80}, number = {2}, year = {1997}, zbl = {0886.20027}, url = {http://geodesic.mathdoc.fr/item/MS2_1997__80_2_167419/} }
Bilal Vatansever. Efficient presentations of the group PSL(2, Z...) x PSL(2, Z...), for certain n, m.. Mathematica Scandinavica, Tome 80 (1997) no. 2, pp. 188-194. http://geodesic.mathdoc.fr/item/MS2_1997__80_2_167419/