TY - RPRT TI - Evaluation of two-photon nonlinearity by a semiclassical method. AU - Kazuki Koshino AU - Hajime Ishihara PY - 2004 DO - 10.1103/physrevlett.93.173601 UR - https://pubmed.ncbi.nlm.nih.gov/15525076/ ID - 15525076 ER -