Generalized Tamm–Dancoff approximation (GTDA) and random-phase approximation (GRPA) calculations on LiH, Be, and Li2 - Sangfelt, E.; Chowdhury, R. Roy; Weiner, B.; O¨hrn, Y. (American Institute of Physics (AIP), 1987)
http://dx.doi.org/10.1063/1.452728
Keywords: U; V