参考文献

Adam, Jean-Michel; Aebi, Johannes; Binggeli, Alfred; Green, Luke; Hartmann, Guido; Maerki, Hans P.; Mattei, Patrizio; Ricklin, Fabienne; Roche, Olivier Patent: US2010/22518 A1, 2010 ; Location in patent: Page/Page column 39 ; US 20100022518 A1