@article{MS2_1976__39_166490,
     author = {Gunnar Dirdal},
     title = {Congruences for the {Fourier} coefficients of certain modular forms.},
     journal = {Mathematica Scandinavica},
     pages = {131--145},
     publisher = {mathdoc},
     volume = {39},
     year = {1976},
     zbl = {0344.10014},
     url = {http://geodesic.mathdoc.fr/item/MS2_1976__39_166490/}
}