1. Kaplan RM: Drug resistance in nematodes of veterinary importance; a status report. Trends Parasitol. 2004, 20: 477-481. 10.1016/j.pt.2004.08.001.
2. Sarginson ND, Jackson F, Scott PR: Multiple anthelmintic resistance in sheep. Vet Rec. 2001, 14: 778-779.
3. O’Brien DJ: Anthelmintic resistance in sheep. Irish Veterinary News. 1992, 14: 25-26.
4. O’Brien DJ, Strickland KL, Parr SL, Gray JS, O’Reilly PF, Clements L, Dwyer PJ, O’Reilly LM, Coles GC, Borgsteede FHM, Geerts S: Anthelmintic resistant nematodes in farm animals in Ireland. Anthelmintic Resistance in Nematodes of Farm Animals. A Seminar Organised for the European Commission, 8–9 November 1994; Brussels. Edited by: Coles GC, Borgsteede FHM. 1994, 101-106.
5. Parr SL, Gray JS: Proceedings of the 18th Annual Research Meeting of the Irish Grassland and Animal Production Association: 3 April. A preliminary survey of the prevalence of benzimidazole resistance in gastro-intestinal nematodes of sheep in the Republic of Ireland. 1992, Ireland: UCD, 3-4.