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2. A comparison of maternal and foetal folic acid and B12;Baker, H.; Ziffer, H.; Pasher, I.; Sobotka, H.,1958
3. British Medical;Journal
4. Folic acid and vitamin B12 levels in pregnancy and their relationship to megaloblastic anaemia;Ball, E.W.; Giles, C.;journal cf Clinical Pathology,1964
5. The distribution of amino acids between erythrocytes and plasma in fetal and maternal blood;Bjdrnesjo, K.B.;Clinica Chimica Acta,1968