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2. Pulmonary hyaline membranes in newborn infants;Blysted;Pediatrics,1951
3. The growth of cells in serumfree hormone-supplemented media;Bottenstein,1979
4. Present status of intrauterine diagnosis of genetic defects;Burton;American Journal of Obstetrics and Gynecology,1974
5. Enzymes in the amniotic fluid;Burton,1978