1. Mixtures of anthelmintics: A strategy against resistance
2. Anonymous (1988 )-Report of the Working Party on Anthelmintic Resistance, Convenor : PJ Waller, Sydney, 1988 , 30 pp.
3. AD Donald, FHM Borgsteede, SV Henriksen, and HJ Over (1983 )-InFacts and Reflections IV. "Resistance of Parasites to Anthelmintics ", Proceedings CEC Workshop, Central Veterinary Institute, Lelystad, 1982, Central Veterinary Institute, Lelystad, p15 .
4. Availability to grazing sheep of gastrointestinal nematode infection arising from summer contamination of pastures