L. Liu, X. Ming Song, J. Tao Guan, Z. Yong Zhang, and B. Mei Wei, “An Efficient and Recyclable Catalytic System: PdCl2-Dppc+ -PF6– -[bmim][PF6] for Heck Coupling Reaction”, ajc, vol. 27, no. 6, pp. 2093–2095, Mar. 2015.