1. Efficacy of ivermectin in oral paste formulation against immature gastrointestinal and pulmonary nematodes in cattle;Alva-Valdes;Am. J. Vet. Res.,1984
2. Efficacy of ivermectin in a topical formulation against induced gastrointestinal and pulmonary nematode infections and naturally acquired grubs and lice in cattle;Alva-Valdes;Am. J. Vet. Res.,1986
3. Prophylactic efficacy of an ivermectin sustained-release bolus against challenge exposure with gastrointestinal and pulmonary nematode infective larvae in calves;Alva-Valdes;Am. J. Vet. Res.,1988
4. Controlled release technology for the control of helminths in ruminants;Anderson;Vet. Parasitol.,1985
5. Observations on Ostertagiasis in young cattle over two grazing seasons with special reference to plasma pepsinogen levels;Armour;Vet. Rec.,1979