How should the psychological well‐being of zoo elephants be objectively investigated?. Mason, G. & Veasey, J. Zoo Biol, 29:237–255, 2010.
bibtex   
@article{mason_how_2010,
	title = {How should the psychological well‐being of zoo elephants be objectively investigated?},
	volume = {29},
	language = {en},
	journal = {Zoo Biol},
	author = {Mason, G. and Veasey, J.},
	year = {2010},
	pages = {237--255},
}

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