Narasimhan, S.; Balakrishnan, M.; Kumar, A. S.; Venkatasubramanian, N.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1985 , vol. 24, p. 568 - 570

Albert, Klaus; Peters, Bernadette; Bayer, Ernst; Treiber, Ulrich; Zwilling, Michael
Zeitschrift fuer Naturforschung, Teil B: Anorganische Chemie, Organische Chemie, 1986 , vol. 41, # 3 p. 351 - 358