Non-stability of Paneitz-Branson equations in arbitrary dimensions
  Let $(M,g)$ be a compact riemannian manifold of dimension $n\geq 5$. We are interested in the stability of a slighly subcritical Paneitz-Branson type equation on $M$. Assuming that there exists a positive nondegenerate solution of the critical equation and under suitable conditions, we prove that this equation is not stable for all $n\geq 5$. 
Laurent Bakri, Jean-Baptiste Cast\'eras
math.AP