@article{10_4064_aa114_2_5,
     author = {Alina Carmen Cojocaru and Ernst Kani},
     title = {The modular degree and the congruence number
 of a weight 2 cusp form},
     journal = {Acta Arithmetica},
     pages = {159--167},
     publisher = {mathdoc},
     volume = {114},
     number = {2},
     year = {2004},
     doi = {10.4064/aa114-2-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa114-2-5/}
}