@article{EXMA_1997__6_2_228399,
     author = {van Geemen, Bert and van der Kallen, Wilberd and Top, Jaap and Verberkmoes, Alain},
     title = {Hecke eigenforms in the cohomology of congruence subgroups of .},
     journal = {Experimental mathematics},
     pages = {163--174},
     publisher = {mathdoc},
     volume = {6},
     number = {2},
     year = {1997},
     zbl = {1088.11037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMA_1997__6_2_228399/}
}