%0 Journal Article %T Biological Gestational Age and Its Calendar Assessment with Ultrasound %A Klimek, R. %A Klimek, M. %J Gynäkologisch-geburtshilfliche Rundschau %V 32 %N 3 %P 159-163 %@ 1018-8843 %D 1992-01-01 %I S. Karger AG %~ DeepDyve