Knight, Derek J.; Lin, Peter; Whitham, Gordon H.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1987 , p. 2707 - 2714
Janssen, Cornelus G. M.; Hendriks, Adrianus H. M.; Godefroi, Erik F.
Recueil: Journal of the Royal Netherlands Chemical Society, 1984 , vol. 103, # 7-8 p. 220 - 224