Handa, Sandeep; Nair, Prathap S.; Pattenden, Gerald Helvetica Chimica Acta, 2000, vol. 83, # 9 p. 2629 - 2643 doi: 10.1002/1522-2675(20000906)83:9<2629::AID-HLCA2629>3.0.CO;2-W