N. G. Grigorieva, S. V. Bubennov, A. N. Khazipova, L. F. Korzhova, and B. I. Kutepov, “Coligomerization of Styrene and a-Methylstyrene Catalyzed by y Zeolites”, Eurasian Chem.-Technol. J., vol. 12, no. 1, pp. 37–44, Jan. 2010.