%0 Journal Article %A Francesc Bars %A Aristides Kontogeorgis %A Xavier Xarles %T Bielliptic and hyperelliptic modular curves $X(N)$ and the group $\mathrm {Aut}(X(N))$ %J Acta Arithmetica %D 2013 %P 283-299 %V 161 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/aa161-3-6/ %R 10.4064/aa161-3-6 %G en %F 10_4064_aa161_3_6