Optical properties of the quasi-two-dimensional dichalcogenides 2H-TaSe2 and 2H-NbSe2S. V. Dordevic, D. N. Basov, R. C. Dynes, B. Ruzicka, V. Vescoli, L. Degiorgi, H. Berger, R. Gaál, L. Forró and E. BucherEur. Phys. J. B, 33 1 (2003) 15-23DOI: https://doi.org/10.1140/epjb/e2003-00136-1