@article{EXMA_2003__12_1_51027,
     author = {Halberstadt, Emmanuel and Kraus, Alain},
     title = {On the modular curve . {(Sur} la courbe modulaire .)},
     journal = {Experimental mathematics},
     pages = {27--40},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {2003},
     zbl = {1050.11056},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_2003__12_1_51027/}
}