TY  - RPRT
TI  - Quantum beats in photon echo from four-waving mixing.
AU  - X Zhu
AU  - MS Hybertsen
AU  - PB Littlewood
PY  - 1994
DO  - 10.1103/physrevlett.73.209
UR  - https://pubmed.ncbi.nlm.nih.gov/10056757/
ID  - 10056757
ER  -