Nishio, Takehiko; Shiwa, Kiyoko; Sakamoto, Masami Helvetica Chimica Acta, 2002, vol. 85, # 8 p. 2383 - 2393 doi: 10.1002/1522-2675(200208)85:8<2383::AID-HLCA2383>3.0.CO;2-E