Bakker, M. J., Vergeer, F. W., Hartl, F., Goubitz, K., Fraanje, J., Rosa, A., & Floch, P. (2000). Unprecedented coordination of 4,4 ',5,5 '-tetramethyl-2,2 '- biphosphinine doubly bridging over an open triosmium. European Journal of Inorganic Chemistry, 5, 843-845.