1. [A IV] G. Shimura, Correction to: “Modular forms of half integral weight”, Modular functions of one variable, IV (Proc. Internat. Summer School, Univ. Antwerp, Antwerp, 1972), Springer, Berlin, 1975, p. 145. Lecture Notes in Math., Vol. 476.
2. [A-L] A. O. L. Atkin and W. Li, Twists of newforms and pseudo-eigenvalues of $W$-operators, Invent. Math. 48 (1978), no. 3, 221–243.
3. [Ha] A. Hales, Stable augmentation quotients of abelian groups, Pacific J. Math. 118 (1985), no. 2, 401–410.
4. [La 1] S. Lang, Introduction to modular forms, Springer-Verlag, Berlin, 1976.
5. [LA 2] S. Lang, Fundamentals of Diophantine geometry, Springer-Verlag, New York, 1983.