TY  - RPRT
TI  - Calculation of optical matrix elements with nonlocal pseudopotentials.
AU  - AJ Read
AU  - RJ Needs
PY  - 1991
DO  - 10.1103/physrevb.44.13071
UR  - https://pubmed.ncbi.nlm.nih.gov/9999492/
ID  - 9999492
ER  -