Dunstan, James B. F.; Elsey, Gordon M.; Russell, Richard A.; Paul Savage; Simpson, Gregory W.; Tiekink, Edward R. T.
Australian Journal of Chemistry, 1998 , vol. 51, # 6 p. 499 - 509

Katada, Tomonori; Eguchi, Shoji; Sasaki, Tadashi
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1984 , # 11 p. 2641 - 2647

Huisgen,R. et al.
Justus Liebigs Annalen der Chemie, 1962 , vol. 658, p. 169 - 180