%0 Journal Article %A Ken-ichi Tahara %T On the Second Cohomology Groups of Semidirect Products. %J Mathematische Zeitschrift %D 1972 %P 365-380 %V 129 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZ_1972__129_171844/ %F MZ_1972__129_171844