TY - RPRT TI - Classical phase changes in nonlinear processes and their quantum counterparts. AU - GS Agarwal AU - S Chaturvedi AU - K Tara AU - V Srinivasan PY - 1992 DO - 10.1103/physreva.45.4904 UR - https://pubmed.ncbi.nlm.nih.gov/9907573/ ID - 9907573 ER -