https://opg.optica.org/josab/abstract.cfm?uri=josab-15-12-2951 (Any fulltext)
Fischer, P., & Buckingham, A. (1998). Surface second-order nonlinear optical activity. Journal of the Optical Society of America B-Optical Physics, 15(12), 2951-2957. doi:10.1364/JOSAB.15.002951.