F. Sambeek

Performance of commercial laying hen genotypes on free range and organic farms in Switzerland, France and The Netherlands

F. Leenstra, V. Maurer, M. Bestman, 2012, British poultry science.

Low input breeds: search for the ideal laying hen for organic and free range systems.

Monique Bestman, Veronika Maurer, Esther Zeltner, 2011 .