1. Hartmann, F., Hlin. Wschr. 44, 1053 (1966)
2. Hutton, J. J. jr., Tappel, A. L., Udenfriend, S., Analyt. Biochem. 16, 384 (1966)
3. Langness, U., Kriegel, ÜJ., Klin. üJschr. 47, 717 (1969)
4. Le Roy, E. C., Kaplan, A., Udenfriend, S., Sjoerdsma, A., A hydroxyproline containing, collagen-like protein in plasma and a procedure for its assay
5. Prockop, J. D., Udenfriend, S., Analyt. Biochem. 1, 228 (1960)