@article{10_4064_aa129_1_4,
     author = {Winfried Kohnen and Jyoti Sengupta},
     title = {The first negative {Hecke} eigenvalue of a {Siegel} cusp
 form of genus two},
     journal = {Acta Arithmetica},
     pages = {53--62},
     publisher = {mathdoc},
     volume = {129},
     number = {1},
     year = {2007},
     doi = {10.4064/aa129-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa129-1-4/}
}