@article {104021,
	title = {Effect of foraging material and food form on feather pecking in laying hens },
	journal = {Br. Poult. Sci.},
	volume = {41},
	year = {2000},
	pages = {16-21},
	author = {Aerni, V. and El-lethey, H. and Wechsler, B.}
}
