参考文献

Andreini, Matteo; Gabellieri, Emanuele; Guba, Wolfgang; Hilpert, Hans; Mayweg, Alexander V.; Narquizian, Robert; Power, Eoin; Travagli, Massimiliano; Woltering, Thomas; Wostl, Wolfgang; Mauser, Harald Patent: US2012/184540 A1, 2012 ; Location in patent: Page/Page column 39 ; US 20120184540 A1