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M. Hill, M. Bičíková, A. Pařízek, H. Havliková, J. Klak, T. Fajt, M. Meloun, D. Cibula, A. Čegan, J. Šulcová, R. Hampl, L. Stárka: Neuroactive Steroids, Their Precursors and Polar Conjugates during Parturition and Postpartum in Maternal Blood: 2. Time Profiles of Pregnanolone Isomers, J. Steroid Biochem. Mol. Biol., 78, 51 - 57 (2001).