Petzelt, J., Komandin, G. A., Voitsekhovskii, V. V., Koukal, V. Infrared and near-millimetre dielectric spectroscopy of some commercial microwave ceramics. In: WASER, R., ed. Proceedings Electroceramics IV. Vol. 1. Aachen: Verlag der Augustinus Buchhandlung, 1994, s. 17-22.