Magnetic Rayleigh-Taylor instability for Pulsar Wind Nebulae in expanding Supernova Remnants N. Bucciantini, E. Amato, R. Bandiera, J. M. Blondin and L. Del Zanna A&A, 423 1 (2004) 253-265 Published online: 29 July 2004 DOI: 10.1051/0004-6361:20040360