Yj. Lee et al., DERIVATION OF THE LINE-SHAPE FUNCTION FOR DIRECT INTERBAND-TRANSITIONS BY THE COMBINED PROJECTION TECHNIQUE, Journal of the Korean Physical Society, 27(2), 1994, pp. 195-199
The line-shape function for direct interband transitions is derived by
using the combined projection technique. The function obtained for el
ectron-phonon systems is similar to those introduced before by the pre
sent group.