1. M. Hatano, K. Kayou, Europeen Patent No. 318,295, 1988.
2. T. Ushikubo, K. Oshima, A. Kayo, T. Umezawa, K. Kiyono, I. Sawaki, Europeen Patent No. 529,853, 1992.
3. T. Ushikubo, K. Oshima, A. Kayou, T. Umezawa, K. Kiyono, I. Sawaki, H. Nakamura, US Patent No. US5472925 (1995).
4. New synthesis route for Mo–V–Nb–Te mixed oxides catalyst for propane ammoxidation
5. T. Ushikubo, K. Oshima, A. Kayou, M. Hatano, in: C. Li, Q. Xin (Eds.), Study of Surface Science and Catalylis, Elsevier, Amsterdam, 1997, p. 473.