On a Riemannian Manifold M with Structures Defined by Nilpotent Operators Florence Gouli-Andreou — 1980 Δελτίο της Ελληνικής Μαθηματικής Εταιρίας
Conformally flat contact metric manifolds with Q ξ = ϱ ξ . Gouli-Andreou, Florence; Tsolakidou, Niki — 2004 Beiträge zur Algebra und Geometrie