@article{oai:tsukuba.repo.nii.ac.jp:00017305,
 author = {Kogiso, Takeyoshi and Tsushima, Koji},
 issue = {3},
 journal = {Tsukuba Journal of Mathematics},
 month = {Dec},
 pages = {645--656},
 title = {On an algebra of Siegel modular forms associated with the theta group Γ_2(1,2)},
 volume = {22},
 year = {1998}
}