KLOPPER, A I A method for the assay of oestriol in pregnancy urine. [electronic resource] - The Journal of obstetrics and gynaecology of the British Empire Aug 1962 - 533-8 p. digital Publication Type: Journal Article ISSN: 0307-1871 Standard No.: 10.1111/j.1471-0528.1962.tb01235.x doi Subjects--Topical Terms: Biological AssayBody FluidsContraceptive Agents, FemaleEstradiol CongenersEstriolEstrogens--urineFemaleHumansPregnancy