Characterizations and integral formulae for generalized quasi-Einstein   metrics
  The aim of this paper is to present some structural equations for generalized quasi-Einstein metrics which was defined recently by Catino in [12]. In addition, supposing that the Riemannian manifold is Einstein we shall show that it is a space form with a well defined potential function f. Finally, we shall derive some integral formulae for such a class of compact manifolds which permit to obtain some rigidity results. 
Abd\^enago Barros and Ernani Ribeiro Jr
math.DG