We extend Guerzhoy's Maass-modular grids on the full modular group SL₂(ℤ) to congruence subgroups Γ₀(N) and Γ₀⁺(p).
@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa160-2-3,
author = {Bumkyu Cho and SoYoung Choi and Chang Heon Kim},
title = {Harmonic weak Maass-modular grids in higher level cases},
journal = {Acta Arithmetica},
volume = {161},
year = {2013},
pages = {129-141},
zbl = {1294.11059},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa160-2-3}
}
Bumkyu Cho; SoYoung Choi; Chang Heon Kim. Harmonic weak Maass-modular grids in higher level cases. Acta Arithmetica, Tome 161 (2013) pp. 129-141. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa160-2-3/