Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Takashi Ono,On certain cohomology set for Γ0(N)(2),"Proceedings of the Japan Academy. Series. A, Mathematical sciences",03862194,Tokyo : Japan Academy,2001-09,77,7,108-110,https://cir.nii.ac.jp/crid/1523669555244513408,