1. Gross, B.: Heights and the special values ofL-series, to appear in S�m. Math. Sup., Presses Univ. Montr�al.
2. Hsia, J.S., Hung, D.C.: Theta series of ternary and quaternary quadratic forms. Invent. math.73, 151?156 (1983)
3. Lect. Notes Math.;F. Hirzebruch,1971
4. Hirzebruch, F.: Hilbert modular surfaces. L'Enseignement Math.19, 183?281 (1973)
5. Lect. Notes Math.;F. Hirzebruch,1974