Wilkinson, G.; Pauson, P. L.; Cotton, F. A. Bis-cyclopentadienyl Compounds of Nickel and Cobalt. Journal of the American Chemical Society. 1954, 76 (7): 1970–1974. Bibcode:1954JAChS..76.1970W. doi:10.1021/ja01636a080.
Wilkinson, G.; Pauson, P. L.; Cotton, F. A. Bis-cyclopentadienyl Compounds of Nickel and Cobalt. Journal of the American Chemical Society. 1954, 76 (7): 1970–1974. Bibcode:1954JAChS..76.1970W. doi:10.1021/ja01636a080.