Pérez-Gálvez, A., Negro-Balmaseda, J.J., Mínguez-Mosquera, M.I., Cascajo-Almenara, M.V. and Garrido-Fernández, J. 2008. Astaxanthin from Crayfish (Procambarus clarkii) as a Pigmentary Ingredient in the Feed of Laying Hens. Grasas y Aceites. 59, 2 (Jun. 2008), 139–145. DOI:https://doi.org/10.3989/gya.2008.v59.i2.502.