@article{CM_1988__65_1_51_0,
     author = {Kenku, M. A. and Momose, Fumiyuki},
     title = {Automorphism groups of the modular curves $X_0(N)$},
     journal = {Compositio Mathematica},
     pages = {51--80},
     publisher = {Kluwer Academic Publishers},
     volume = {65},
     number = {1},
     year = {1988},
     mrnumber = {930147},
     zbl = {0686.14035},
     language = {en},
     url = {http://www.numdam.org/item/CM_1988__65_1_51_0/}
}