Imogai, Hassan; Bernardinelli, Gerald; Graenicher, Christian; Moran, Mary; Rossier, Jean-Claude; Mueller, Paul Helvetica Chimica Acta, 1998, vol. 81, # 10 p. 1754 - 1764 doi: 10.1002/(SICI)1522-2675(19981007)81:10<1754::AID-HLCA1754>3.0.CO;2-V