1. J. Haber: Z. Chem.,13, 241 (1973),
2. J. Haber, B. Grzybowska: J. Catal.,28, 489 (1973)
3. K. German, B. Grzybowska, J. Haber: Bull. Acad. Polon. Sci., Ser. Sci. Chim.,21, 319 (1973)
4. B. Grzybowska, K. German, J. Haber, J. Sloczynski: Proc. Intern. Conference on the Mechanism of Heterogeneous Catalytic Reactions, Moscow, September 1974, preprint No. 105.
5. G. K. Boreskov: Kinet. Katal.,14, 7 (1973)