%0 Journal Article %A Ashraf, Mohammad %T On left $(\theta,\varphi)$-derivations of prime rings %J Archivum mathematicum %D 2005 %P 157-166 %V 41 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/ARM_2005__41_2_a3/ %G en %F ARM_2005__41_2_a3