Hoffmann-La Roche Inc.
Patent: US4927958 A1, 1990 ;

Morrissey, Saibh; Pegot, Bruce; Coleman, Deborah; Garcia, M. Teresa; Ferguson, Damien; Quilty, Brid; Gathergood, Nicholas
Green Chemistry, 2009 , vol. 11, # 4 p. 475 - 483

Schneider, David F.; Viljoen, Murray S.
Synthetic Communications, 2002 , vol. 32, # 5 p. 721 - 728