In vitro study of ivermectin efficiency against the cattle tick, Rhipicephalus (Boophilus) annulatus, among cattle herds in El-Beheira, Egypt oleh Gaber E. Batiha, Ali H. El-Far, Amany A. El-Mleeh, Abdelwahab A. Alsenosy, Eman K. Abdelsamei, Mohamed M. Abdel-Daim, Yasser S. El-Sayed, Hazem M. Shaheen