1. Purines de porcino (II);Abaigar;Navarra Agraria,1999
2. The Nutrient Requirements of Pigs,1981
3. El cultivo de la Patata;Alonso,1996
4. Environmental nutrition: minimizing excretion of copper and zinc;Armstrong;Swine News,1999
5. Gestión de subproductos y residuos porcinos;Babot;Mundo ganadero, Mayo,2001