Who needs ‘behavioural needs’? Motivational aspects of the needs of animals. Jensen, P. & Toates, F. Appl. Anim. Behav. Sci, 37:161–181, 1993.
bibtex   
@article{jensen_who_1993,
	title = {Who needs ‘behavioural needs’? {Motivational} aspects of the needs of animals},
	volume = {37},
	language = {en},
	journal = {Appl. Anim. Behav. Sci},
	author = {Jensen, P. and Toates, F.},
	year = {1993},
	pages = {161--181},
}

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