1. Y. Schächter, H. Pines: J. Catalysis,11, 147 (1968)
2. K. Tanabe, N. Yoshii, H. Hattori: Chem. Comm., 464 (1971)
3. H. Hattori, N. Yoshii, K. Tanabe: 5th Intern. Congr Catalysis, Palm Beach, 1972, Preprint No. 10.
4. Neth. Appl. 6506830 (G. E. Co.).
5. K. Saito, K. Tanabe: Shokubai,11, 206 (1969)