TY  - RPRT
TI  - Efficient algorithm for calculating two-photon absorption spectra.
AU  - T Iitaka
AU  - T Ebisuzaki
PY  - 1999
DO  - 10.1103/physreve.60.r1178
UR  - https://pubmed.ncbi.nlm.nih.gov/11969947/
ID  - 11969947
ER  -