@article{mellen_philosophy_2001,
	title = {Philosophy of environmental enrichment: past, present, and future},
	volume = {20},
	language = {it},
	journal = {Zoo Biol},
	author = {Mellen, J.D. and Sevenich MacPhee, M.},
	year = {2001},
	pages = {211--226},
}

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