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Kappeli, S.; Gebhardt, Sabine; Frohlich, E.; Pfulg, A.; Stoffel, Michael Hubert (2011). Prevalence of keel bone deformities in Swiss laying hens. British poultry science, 52(5), pp. 531-6. Abingdon, UK: Taylor & Francis 10.1080/00071668.2011.615059
Stämpfli, K.; Buchwalder, T.; Fröhlich, E.K.F.; Roth, B.A. (2012). Influence of front curtain design on nest choice by laying hens. British poultry science, 53(5), pp. 553-560. Taylor & Francis 10.1080/00071668.2012.725201
LENTFER, T L; PENDL, H; Gebhardt, Sabine; FRÖHLICH, E K F; VON BORELL, E (2015). H/L ratio as a measurement of stress in laying hens - methodology and reliability. British poultry science, 56(2), pp. 157-163. Taylor & Francis 10.1080/00071668.2015.1008993
