Back,T.G. et al.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1976 , p. 2079 - 2089

Taylor,E.C.; Haley,N.F.; Clemens,R.J.
Journal of the American Chemical Society, 1981 , vol. 103, p. 7743