A comparison of the behaviour of solitary and group-housed budgerigars. Nicol, C. & Pope, S. ‎Anim. Welf, 2:269–277, 1993.
bibtex   
@article{nicol_comparison_1993,
	title = {A comparison of the behaviour of solitary and group-housed budgerigars},
	volume = {2},
	language = {en},
	journal = {‎Anim. Welf},
	author = {Nicol, C. and Pope, S.},
	year = {1993},
	pages = {269--277},
}

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