参考文献

ORION CORPORATION; Törmakängas, Olli; Wohlfahrt, Gerd; Salo, Harri; Ramasurbamanian, Rathna Durga; Patra, Pranab Kumar; Martin, Arputharaj Ebenezer; Heikkinen, Terhi; Vesalainen, Anniina; Moilanen, Anu; Karjalainen, Arja Patent: US2014/94474 A1, 2014 ; Location in patent: Page/Page column ;