Vatansever B. Efficient presentations of the group $\mathrm{PSL}(2, Z_n) \times \mathrm{PSL}(2, Z_m)$, for certain $n$, $m$. Math. Scand. [Internet]. 1997 Dec. 1 [cited 2026 Aug. 14];80:188-94. Available from: https://tidsskrift.dk/math/article/view/12618