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Greco, Brian J., Cheryl L. Meehan, Lance J. Miller, David J. Shepherdson, Kari A. Morfeld, Jeff Andrews, Anne M. Baker, Kathy Carlstead, a Joy A. Mench. "Elephant Management in North American Zoos: Environmental Enrichment, Feeding, Exercise, and Training." PLoS One 2016.

Greco, Brian J., et al. "Elephant Management in North American Zoos: Environmental Enrichment, Feeding, Exercise, and Training." PLoS One 2016.