%0 Journal Article %A Florence Gouli-Andreou %T On a Riemannian Manifold M with Structures Defined by Nilpotent Operators %J Δελτίο της Ελληνικής Μαθηματικής Εταιρίας %D 1980 %P 21-30 %V 21 %I mathdoc %U http://geodesic.mathdoc.fr/item/DEME_1980__21_a2/ %G gr %F DEME_1980__21_a2