1. A study of the transformation of progesterone by human gingival tissue;ElAttar,1970
2. Transformation of hormonal steroids in human gingiva;ElAttar,1970
3. Catabolism of male and female sex hormones in human gingiva;ElAttar,1971
4. Metabolism of progesterone-7a-3H in vitro in human gingiva with periodontitis;ElAttar;J. Periodont.,1971
5. Characteristic bioconversion of progesterone in human gingiva with chronic periodontitis;ElAttar,1972