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Zetterer, T. and Ose, W. and SChützmann, J. and Otto, H. H. and Obermayer, P. E. and Tasler, N. and Lengfellner, Hans and Lugert, G. and Keller, J. and Renk, Karl Friedrich (1989) Preparation, characterization, and far-infrared study of ceramic high-Tc superconductors. Journal of the Optical Society of America B: Optical Physics (JOSA B) 6 (3), pp. 420-435.
Ose, W. and Obermayer, P. E. and Otto, H. H. and Zetterer, T. and Lengfellner, Hans and Tasler, N. and Keller, J. and Renk, Karl Friedrich (1988) Far-infrared reflectivity and dynamical conductivity of YBa2Cu3O7. Physica C: Superconductivity and its Applications 153-15 (Part 2), pp. 639-640.