T. B. Rodenburg, A. J. Buitenhuis, B. Ask, K. A. Uitdehaag, P. Koene, J. J. van der Poel, J. A. M. van Arendonk, H. Bovenhuis,
Genetic and phenotypic correlations between feather pecking and open-field response in laying hens at two different ages. Behavior Genetics. ,vol. 34, pp. 407- 415 ,(2004) ,
10.1023/B:BEGE.0000023646.46940.2D