1. 1. B. A. Krentzel, Y. V. Kissin, V. I. Kleiner, and L. L. Stotskaya, “Polymers and Copolymers of Higher α-Olefins”, 1997, Chap. 1, Hanser, Munich.
2. 2. J. M. Thomas and W. J. Thomas, “Principles and Practice of Heterogeneous Catalysis”, 1997, Chap. 3, Wiley, New York, 145 - 254.
3. 3. A. Sharlani, J. C. Hsu, and D. W. Bacon, in “Progress and Development of Catalytic Olefin Polymerization”, ed. T. Sano, T. Uozumi, H. Nakatani, and M. Terano, 2002, Technology and Education Publishers, Tokyo, 53 - 64.
4. 4. A. Muñoz-Escalona, A. Fuentes, J. Liscano, and A. Albornoz, in “Catalytic Olefin Polymerization”, ed. T. Keii and K. Soga, 1990, Kodansha, Tokyo, 377 - 404.
5. Effect of di-n-butyl ether on the synthesis of Ziegler–Natta catalyst for propylene polymerization