@article{AIF_1987__37_2_19_0,
     author = {Tchangang, Tambekou Roger},
     title = {Le groupe d'automorphismes du groupe modulaire},
     journal = {Annales de l'Institut Fourier},
     pages = {19--31},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {37},
     number = {2},
     year = {1987},
     doi = {10.5802/aif.1084},
     zbl = {0584.57019},
     language = {fr},
     url = {http://archive.numdam.org/articles/10.5802/aif.1084/}
}