参考文献

Yang, Beom-Seok; Kim, Yong-Zu; Park, Tae-Kyo; Woo, Sung-Ho; Lee, Hyang-Sook; Kim, Sun-Young; Cho, Jong-Un; Lee, Hong-Bum Patent: US2013/72482 A1, 2013 ; Location in patent: Paragraph 0315-0317 ;