@article{10_4064_aa103_3_2,
     author = {G. Chinta and N. Diamantis and C. O'Sullivan},
     title = {Second order modular forms},
     journal = {Acta Arithmetica},
     pages = {209--223},
     publisher = {mathdoc},
     volume = {103},
     number = {3},
     year = {2002},
     doi = {10.4064/aa103-3-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa103-3-2/}
}