TY  - RPRT
TI  - Analytic continuation of quantum systems and their temporal evolution.
AU  - EC Sudarshan
AU  - CB Chiu
PY  - 1993
DO  - 10.1103/physrevd.47.2602
UR  - https://pubmed.ncbi.nlm.nih.gov/10015857/
ID  - 10015857
ER  -