TY  - RPRT
TI  - Two theorems in catoptrics.
AU  - J Rubinstein
AU  - G Wolansky
PY  - 2002
DO  - 10.1364/josaa.19.000129
UR  - https://pubmed.ncbi.nlm.nih.gov/11778715/
ID  - 11778715
ER  -