1. Cohen, H.: Sommes de carrés, fonctionsL et formes modulaires. C.R. Acad. Sci. Paris277, 827–830 (1973)
2. Cohen, H., Oesterlé, J.: Dimensions des espaces de formes modulaires. Modular functions of one variable. VI. In: Lecture Notes in Mathematics, Vol. 627, pp. 69–78. Berlin, Heidelberg, New York: Springer 1976
3. Coxeter, H.S.M.: Extreme forms. Canad. J. Math.III 391–441 (1951)
4. Dickson, L.E.: Studies in the theory of numbers. Chicago: The University of Chicago Science Series 1930
5. Kohnen, W.: Modular forms of half integral weight onΓ 0(4). Math. Ann.248, 249–266 (1980)