参考文献

Dams, Gery Karel Julia; Vereycken, Inge; Van Acker, Koenraad Lodewijk August; Gustin, Emmanuel Marie Paul Ernest; Verschueren, Wim Gaston; Ohagen, Asa Catrine Patent: US2010/280268 A1, 2010 ; Location in patent: Page/Page column 57 ;