1. Thermally processed keratin films
2. Extrusion of feather keratin
3. American Society for Testing and Materials. Standard test method for determining aerobic biodegradation of plastic materials under controlled composting conditions, ASTM D5338-92.
4. Narayan R. Food and biobased cafeteriaware composting for federal facilities in Washington, DC; Dec. 8, 2005. p. 28–35 and references therein.