Nopparatmaitree, M., A. Panthong, S. Paengkoum, and P. Saenphoom. “Effects of Asparagus Trims By-Product Supplementation in Laying Hens Diets on Nutrient Digestibility and Productive Performance”. Science, Engineering and Health Studies, vol. 8, no. 1, Jan. 2014, pp. 74-82, doi:10.14456/sustj.2014.6.