@article{bwmeta1.element.bwnjournal-article-doi-10_4064-aa107-3-6,
author = {Sheng Chen and Hong You},
title = {Subrings in imaginary quadratic fields which are not universal for GE2},
journal = {Acta Arithmetica},
volume = {108},
year = {2003},
pages = {299-305},
zbl = {1024.19001},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa107-3-6}
}
Sheng Chen; Hong You. Subrings in imaginary quadratic fields which are not universal for GE₂. Acta Arithmetica, Tome 108 (2003) pp. 299-305. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-doi-10_4064-aa107-3-6/