参考文献:
INTERVET INTERNATIONAL B.V. DE VITA, Robert, J. HONG, QingMei LAI, Zhong DYKSTRA, Kevin, D. YU, Yang LIU, Jian SPERBECK, Donald JIAN, Tianying GUIADEEN, Deodial XU-QIANG YANG, Ginger WU, Zhicai HE, Shuwen TING, Pauline, C. ASLANIAN, Robert KUETHE, Jeffrey, T. BALKOVEC, James, M. KUANG, Rongze ZHOU, Gang WU, Heping Patent: WO0/6407 A, 0 Location in patent: Page/Page column 98-99 WO 0/6407 A