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Anderson DM, Estell RE. Behaviour - The keystone in optimizing free-ranging ungulate production. In: Encycloedia of Life Suport Systems (EOLSS). Oxford, UK: Eolss Publishers; 2009. Abstract
Utsumi SA, Cibils AF, Estell RE, Walker J. One-seed juniper use by goats: Influence of stocking density and mixed grazing in summer and spring. In: Society for Range Management Annual Meeting. Louisville, KY; 2008. 1952. (Society for Range Management Annual Meeting). Abstract