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- [23] STUDIES ON THE BIOGENESIS OF VITAMIN-D .4. GAS-LIQUID CHROMATOGRAPHY-MASS SPECTROMETRIC IDENTIFICATION OF PREVITAMIN-D3 AND VITAMIN-D3 IN THE SKIN OF VITAMIN-D-DEFICIENT RATS IRRADIATED WITH ULTRAVIOLET-LIGHT RECUEIL DES TRAVAUX CHIMIQUES DES PAYS-BAS-JOURNAL OF THE ROYAL NETHERLANDS CHEMICAL SOCIETY, 1979, 98 (05): : 253 - 257