1. Changes in feather condition in relation to feather pecking and aggressive behaviour in laying hens;Bilcik;Br. Poult. Sci.,1999
2. Gunnarson, S., Oden, K., Algers, B., Svedberg, J., Keeling, L., 1995. Poultry health and behaviour in a tiered system for loose housed layers: Report 35. Swedish University of Agricultural Sciences, Skara, ISSN 0283-0698.
3. Feather eating and crop filling in laying hens;Harlander-Matauschek;Arch. Geflügelk.,2005
4. The effect of feather eating on feed passage in laying hens;Harlander-Matauschek;Poult. Sci.,2006
5. The demand of laying hens for feathers and wood shavings;Harlander-Matauschek;Appl. Anim. Behav. Sci.,2006