1. H. Reich, Collagen [Russian translation], Moscow (1969).
2. G. F. Baliant, J. Y Bowes, and C. W. Cater, JSLTC, 55(4), 119–125 (1971).
3. F. S. Steven, Scand. J. Chim. Lab. Invest., 34, Suppl. 14, 36–43 (1974).
4. G. Reich and H. Legutke, Gesammelt Abhandl. Freiberg, No. 1, (1962–1963).
5. M. L. Tanzer, Science, 180, 561–567 (1973).