1. E. A. Taraban, O. P. Krivoruchko, and R. A. Buyanov, Zh. Neorg. Khim.,33, 1824 (1988).
2. L. P. Solov'eva, S. V. Tsybulya, and V. A. Zabolotnyi, POLIKRISTALL: A Software Suite for Structural Calculations [in Russian], Inst. Kataliza, Sib. Otd. Akad. Nauk SSSR, Novosibirsk (1988).
3. É. M. Moroz, V. N. Kuklina, and V. A. Ushakov, Kinet. Katal.,28, 699?708 (1987).