Surface-barrier effects in the microwave second-harmonic response of superconductors in the mixed stateA. Agliolo Gallitto, G. Giunchi, M. Li Vigni and G. VaglicaEur. Phys. J. B, 45 1 (2005) 47-53DOI: https://doi.org/10.1140/epjb/e2005-00163-x