@article{GDZPPN00230886X,
title = {On Modular Forms whose Fourier Coefficients are Non-Negative Integers with the Constant Term Unity.},
journal = {Mathematische Annalen},
volume = {201},
year = {1973},
pages = {187-204},
zbl = {0266.10021},
url = {http://dml.mathdoc.fr/item/GDZPPN00230886X}
}
Ozeki, Michio. On Modular Forms whose Fourier Coefficients are Non-Negative Integers with the Constant Term Unity.. Mathematische Annalen, Tome 201 (1973) pp. 187-204. http://gdmltest.u-ga.fr/item/GDZPPN00230886X/