Bioavailability of contraceptive steroids from capsulesK. Fotherby; R.J. Warren · 1976

Effect of norgestrel administered intermittently on pituitary ovarian functionI. Craft; G.L. Foss; R.J. Warren; K. Fotherby · 1975

Plasma levels of norethisterone in women receiving norethisterone oenanthate intramuscularlyGeraldine Howard; R.J. Warren; K. Fotherby · 1975

Plasma levels of norethisterone measured by radioimmunoassay and gas chromatography-mass fragmentographyK. Fotherby; R.J. Warren; K. Shrimanker; L. Siekmann; Anita Siekmann; H. Breuer · 1979