@article{GDZPPN002233223,
title = {Integral schur algebras for GL2.},
journal = {Manuscripta mathematica},
volume = {76},
year = {1992},
pages = {411-428},
zbl = {0767.20015},
url = {http://dml.mathdoc.fr/item/GDZPPN002233223}
}
Du, Jie. Integral schur algebras for GL2.. Manuscripta mathematica, Tome 76 (1992) pp. 411-428. http://gdmltest.u-ga.fr/item/GDZPPN002233223/