Cu-O network dependence of optical charge-transfer gaps and spin-pair excitations in single-CuO2-layer compounds
Authors Y.Tokura, S.Koshihara, T.Arima, H.Takagi, S.Ishibashi, T.Ido and S.Uchida
Journal Phys. Rev.B
Volume 41 Page 11657-11660 Date 1990