TY - JOUR AU - Antonio CaƱada AU - Salvador Villegas TI - Lyapunov inequalities for Neumann boundary conditions at higher eigenvalues JO - Journal of the European Mathematical Society PY - 2010 SP - 163 EP - 178 VL - 12 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4171/jems/193/ DO - 10.4171/jems/193 ID - JEMS_2010_12_1_a6 ER -