McKay, William R.; Proctor, George R.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1981 , p. 2435 - 2442
Begtrup, Mikael; Nytoft, Hans Peter
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1985 , p. 81 - 86