T.I. Korányi, M. Schikorra, Z. Paál, R. Schlögl, J. Schütze and M. Wesemann: Surface sate, compositon and catalytic activity of slightly sulfided Co–Mo/Al2O3 catalysts pretreated at different temperature. Applied Surface Science68 (3), 307–317 (1993).
M. Muhler, J. Schütze, M. Wesemann, T. Rayment, A. Dent, R. Schlögl and G. Ertl: The nature of the iron oxide-based catalyst for dehydrogenation of ethylbenzene to styrene: I. Solid-state chemistry and bulk characterization. Journal of Catalysis126 (2), 339–360 (1990).