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3. Metabolism and mechanism of action of vitamin D;DeLuca;Ann. Rev. Biochem.,1976
4. The biological activity of the vitamin D metabolite 1,25-dihydroxycholecalciferol in chickens and rats;Norman;J. Nutr.,1972
5. Regulation by calcium of in vivo synthesis of 1,25-dihydroxycholecalciferol and 21,25-dihydroxycholecalciferol;Boyle,1971