@article{CRMATH_2008__346_11-12_603_0,
     author = {David Fithian},
     title = {Congruence obstructions to pseudomodularity of {Fricke} groups},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {603--606},
     publisher = {Elsevier},
     volume = {346},
     number = {11-12},
     year = {2008},
     doi = {10.1016/j.crma.2008.04.005},
     language = {en},
}