参考文献

BOEHRINGER INGELHEIM INTERNATIONAL GmbH; Dahmann, Georg; Fiegen, Dennis; Fleck, Martin; Hoffmann, Matthias; Klicic, Jasna; East, Stephen Peter; Napier, Spencer Charles R.; Scott, John Patent: US2013/23502 A1, 2013 ; Location in patent: Paragraph 0230-0232 ;