TY  - RPRT
TI  - Phase-difference operator.
AU  - A Luis
AU  - LL Sánchez-Soto
PY  - 1993
DO  - 10.1103/physreva.48.4702
UR  - https://pubmed.ncbi.nlm.nih.gov/9910179/
ID  - 9910179
ER  -