1. Wool: Nature’s Wonder Fibre;Leeder,1984
2. Hair—the most sophisticated biological composite material
3. Derivatives of keratin;Goddard;J. Biol. Chem.,1935
4. Hair keratin: Composition, structure and biogenesis;Powell,1986
5. The role of keratin proteins and their genes in the growth, structure and properties of hair;Powell,1997