1. Agis-Torres, A. (1994). Ph. D. Thesis, Universidad Complutense de Madrid, Madrid, Spain.
2. Agis-Torres, A., López-Oliva, M. E., Únzaga, M. T. and Muñoz-Martínez, E. (1996): Comp. Biochem. Physiol., 115, 317–322.
3. Agis-Torres, A., López-Oliva, M. E., Unzaga, M. T. and Muñoz-Martínez, E. (1995): Proc. Nutr. Soc., 54, 1.76.
4. Albertsson, W. K., Alm, F., Aronsson, S., Gustafsson, J., Hagenas, L., Hager, A., Ivarsson, S., Kristrom, B., Marcus, C., Moell, C., Nilsson, K. O., Ritzen, M., Tuvemo, T., Westgren, U., Westphal, O. and Aman, J. (1999): Acta Paediatr., 88, 80–84.
5. AOAC (1990): Official methods of analysis of the Association of Official Analytical Chemists. 15th ed., Washington.