@inproceedings{ShelkanSigmundHizhnyakovetal.2003, author = {Aleksander Shelkan and Ernst Sigmund and Vladimir Hizhnyakov and G{\"o}tz Seibold}, title = {Free and spin-polaron states in high-Tc superconductor}, booktitle = {Proceedings of the NATO Advanced Research Workshop on Colossal Magnetoresistance and Vibronic Interactions and the XVth International Jahn-Teller Symposium on Vibronic Interactions in Crystals and Molecules, Boston, August 16 - 22, 2000}, editor = {Michael D. Kaplan}, pages = {349 -- 356}, year = {2003}, }