TY - JOUR AU - Florence Gouli-Andreou TI - On a Riemannian Manifold M with Structures Defined by Nilpotent Operators JO - Μαθηματική Επιθεώρηση PY - 1981 SP - 21 EP - 30 VL - 21 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MR_1981__21_a2/ LA - gr ID - MR_1981__21_a2 ER -