REFERENCES
- Hon, E. H.: A Manual of Pregnancy Testing. Boston, Little, Brown and Company, 1961.
- Marais, W. D. and DuToit, F. E.: Clinicopathological assessment of the value of urinary estriol assays during the third trimester of pregnancy. S Afr J Obstet Gynec 3: 41, 1965.
- Robertson, J. G. and Maxwell, A. W.: Urinary pregnanediol estimation in pregnancy. J Obstet Gynaec Brit Comm 70: 422, 1963.
- Hobson, B. and Wide, L.: The immunological and biological activity of human gonadotropin in urine. Acta Endocr 46: 302, 1964.
- Berman, R. L.: Biological Pregnancy Tests—Facts and Fiction. New York, Clinical Laboratory, 1962.