Afsharmanesh, M., Samia, A., Porreza, J. (2624). 'Effects of citric and ascorbic acids, vitamin D3 and calcium on efficacy of microbial phytase in a corn-soybean meal-based diet:broiler performance and nutrient digestibility from 1 to 21 of age', Iran Agricultural Research, 22(2), pp. 120-137. doi: 10.22099/iar.2003.4257