@article{GDZPPN002092700,
title = {Intersection Numbers of Curves on Hilbert Modular Surfaces and Modular Forms of Nebentypus.},
journal = {Inventiones mathematicae},
volume = {34},
year = {1976},
pages = {57-114},
zbl = {0332.14009},
url = {http://dml.mathdoc.fr/item/GDZPPN002092700}
}
Hirzebruch, F.; Zagier, D. Intersection Numbers of Curves on Hilbert Modular Surfaces and Modular Forms of Nebentypus.. Inventiones mathematicae, Tome 34 (1976) pp. 57-114. http://gdmltest.u-ga.fr/item/GDZPPN002092700/