1. Bruning, P. F.; Jonker, K. M.; Boerema-Baan, A. D. Adsorption of steroid hormones by plastic tubing. J. Ster. Biochem. 14:553?555; 1981.
2. Levin, J., Frierich, E. H.; Lobotsky, J. Steroid adsorption with polyethylene tubing. J. Clin. Endocrinol Metab. 25:1519?1520; 1958.
3. Westphal, U. Diffusion of progesterone and desoxycorticosterone into nitrocellulose (Lusteroid): A potential source of error in ultracentrifugation. J. Lab. Clin. Med. 51:473?478; 1958.
4. Longman, S. Effect of contraceptive steroids on the growth rate of human mammary epithelia in cell culture. Berkeley, Univ. of California, 1985. Thesis.
5. Schrader, W. T.; O'Malley, B. W. Laboratory methods manual for hormone action and molecular endocrinology, 6th ed. Houston: Department of Cell Biology, Baylor College of Medicine, Texas Medical Center; 1982.