TY - RPRT TI - Two-photon vibrational spectroscopy for biosciences based on surface-enhanced hyper-Raman scattering. AU - Janina Kneipp AU - Harald Kneipp AU - Katrin Kneipp PY - 2006 DO - 10.1073/pnas.0608262103 UR - https://pubmed.ncbi.nlm.nih.gov/17088534/ ID - 17088534 ER -