1. Persistent anthelmintic activity of ivermectin in cattle;Armour;The Vet. Record,1985
2. Persistent anthelmintic effect of ivermectin in cattle;Barth;The Vet. Record,1983
3. The residual effect of treatment with ivermectin after experimental reinfection with nematodes in calves;Borgsteede;The Vet. Quarterly,1986
4. Committee for Veterinary Medicinal Products. Note for Guidance approved by the CVMP on May 23, 1991, Demonstration of efficacy of anthelmintics;Commission of the European Communities;Document III/3869/90-EN,1991
5. Persistent activity of ivermectin topical and moxidectin injection against Ostertagia ostertagi and Dictyocaulus viviparus in calves;Hong;The Vet. Record,1995