Parallel forms, co-K\"ahler Manifolds and their Models
  We show how certain topological properties of co-K\"ahler manifolds derive from those of the K\"ahler manifolds which construct them. In particular, we show that the existence of parallel forms on a co-K\"ahler manifold reduces the computation of cohomology from the de Rham complex to certain amenable sub-cdga's defined by geometrically natural operators derived from the co-K\"ahler structure. This provides a simpler proof of the formality of the foliation minimal model in this context. 
Giovanni Bazzoni, Gregory Lupton, John Oprea
math.DG math.AT