@article{1183532223,
author = {Singer, William M.},
title = {Extension theory for connected Hopf algebras},
journal = {Bull. Amer. Math. Soc.},
volume = {76},
number = {4},
year = {1970},
pages = { 1095-1099},
language = {en},
url = {http://dml.mathdoc.fr/item/1183532223}
}
Singer, William M. Extension theory for connected Hopf algebras. Bull. Amer. Math. Soc., Tome 76 (1970) no. 4, pp. 1095-1099. http://gdmltest.u-ga.fr/item/1183532223/