Doeppert, Karl; Sanchez-Delgado, Roberto; Klein, Heinz-Peter; Thewalt, Ulf
Journal of Organometallic Chemistry, 1982 , vol. 233, # 2 p. 205 - 213

Arora, R. S.; Hari, S. C.; Bhalla, M. S.; Multani, R. K.
Indian Journal of Chemistry, Section A: Inorganic, Physical, Theoretical & Analytical, 1981 , vol. 20, # 2 p. 184 - 185