1. Auber L (1950/51) Trans Royal Sty of Edinburgh, LXII, Part 1, p 7
2. Horio M, Kondo I (1953) Text Res J XXIII, 6:373
3. Mercer EH (1958) Text Res J XXIII, 6:387
4. Wildmann AB (1954) The Microscopy of Animal Textile Fibres, Wool Industries Research Association, Torridon, Headingley Leeds, p 6