TY - RPRT TI - Surface vibrational spectroscopy by infrared-visible sum frequency generation. AU - XD Zhu AU - H Suhr AU - YR Shen PY - 1987 DO - 10.1103/physrevb.35.3047 UR - https://pubmed.ncbi.nlm.nih.gov/9941799/ ID - 9941799 ER -