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  Author Title Year Publication Serial Volume Pages Links
Mench, J.A.; Morrow-Tesch, J.; Chu, L.-R. Environmental enrichment for farm animals 1998 Lab Animal 6188 27 32-36 details   isbn
Meehan, C.L.; Mench, J.A. The challenge of challenge: Can problem solving opportunities enhance animal welfare? 2007 Applied Animal Behaviour Science 2890 102 246-261 details   url
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