1. Li ZX. A review on multipurpose use of apple pomace. J Yellow Cattle Sci. 2002;28(4):58–62.
2. Deng H, Zhang BS, Li XP. Study on preparation of dietary and pectin from apple residue. Food Sci Technol. 2002;5:62–3.
3. Feng WR, Feng WJ. Enzymatic processing of meat co-products into variable products. Food Sci. 2001;22(7):86–7.
4. Zhao XF. Processing and utilization of feather powder. Guangdong Feed. 2002;11(4):13–5.
5. Yang RJ, Zhang WB, Xiao H. A feather protein powder and its preparation method. China Patent, 200910170082.3. 2009.