Peseke, K.; Michalik, M.; Schoenhusen, U.; Quincoces, J.; Radeglia, R.
Journal fuer Praktische Chemie (Leipzig), 1987 , vol. 329, # 5 p. 877 - 884

Saxena, Abhishek S.; Goel, Atul; Ram, Vishnu Ji
Journal of the Indian Chemical Society, 2003 , vol. 80, # 4 p. 311 - 318