@article{1259943312,
author = {TASAKA, Takashi},
title = {On the second cohomology groups of the fundamental groups of simple algebraic groups over perfect fields},
journal = {J. Math. Soc. Japan},
volume = {21},
number = {2},
year = {1969},
pages = { 244-258},
language = {en},
url = {http://dml.mathdoc.fr/item/1259943312}
}
TASAKA, Takashi. On the second cohomology groups of the fundamental groups of simple algebraic groups over perfect fields. J. Math. Soc. Japan, Tome 21 (1969) no. 2, pp. 244-258. http://gdmltest.u-ga.fr/item/1259943312/