Ogg, A. P. (1985). Mauvaise réduction des courbes de Shimura. In Séminaire de théorie des nombres, Paris 1983-84 Progr. Math. 59 199-217 Birkhäuser Boston Boston, MA. [MR] [GS?]
Ogg, A. P. (1984). Some special classes of Cartan matrices. Canad. J. Math. 36 No.5, 800-819. [MR] [GS?]
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Ogg, A. P. (1978). On the Weierstrass points of X_0(N). Illinois J. Math. 22 No.1, 31-35. [MR] [GS?]
