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  2012. Dr M.HAFSTRÖM et al : Developmental outcome at 6.5 years after acidosis in term newborns. A population based study.
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  1983. Dr B.SORBE, S.DAHLGREN : Some important factors in the molding of the fetal head during vaginal delivery. A photographic study.
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  1981. Dr L.LINDGREN : Effects of pressure gradient on the fetal cranium.
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  1960. Dr L.LINDGREN : The causes of foetal head moulding in labour.
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  1935. Dr E.RYDBERG : The significance of the shape of the foetal head in the mecanism of labour.