Some isoperimetric inequalities with application to the Stekloff problem
  In this paper we establish isoperimetric inequalities for the product of some moments of inertia. As an application, we obtain an isoperimetric inequality for the product of the $N$ first nonzero eigenvalues of the Stekloff problem in $\mathbb{R}^N$. 
Antoine Henrot (IECN), G\'erard A. Philippin, Abdesselam Safoui