@article{10_4064_aa123_4_5,
     author = {\"Ozlem Imamoglu and Yves Martin},
     title = {A converse theorem for second-order
 modular forms of level $N$},
     journal = {Acta Arithmetica},
     pages = {361--376},
     publisher = {mathdoc},
     volume = {123},
     number = {4},
     year = {2006},
     doi = {10.4064/aa123-4-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa123-4-5/}
}