@article{GDZPPN002307030, title = {The Hilbert Modular Surface of a Real Quadratic Field.}, journal = {Mathematische Annalen}, volume = {201}, year = {1973}, pages = {25-46}, zbl = {0236.14014}, url = {http://dml.mathdoc.fr/item/GDZPPN002307030} }
Hammond, William F. The Hilbert Modular Surface of a Real Quadratic Field.. Mathematische Annalen, Tome 201 (1973) pp. 25-46. http://gdmltest.u-ga.fr/item/GDZPPN002307030/