Surface-barrier effects in the microwave second-harmonic response of superconductors in the mixed state A. Agliolo Gallitto, G. Giunchi, M. Li Vigni and G. Vaglica Eur. Phys. J. B, 45 1 (2005) 47-53 Published online: 16 June 2005 DOI: 10.1140/epjb/e2005-00163-x