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«Degradation phase of apoptosis during the early stages of human metanephros development». Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub148 (2): 255–6. December 2004. doi:10.5507/bp.2004.054. PMID15744391.
Robinson, H. P.; Fleming, J. E. E. (1975). «A Critical Evaluation of Sonar "crown-Rump Length" Measurements». BJOG: An International Journal of Obstetrics and Gynaecology82 (9): 702–710. doi:10.1111/j.1471-0528.1975.tb00710.x. PMID[1].
Geirsson RT (May 1991). «Ultrasound instead of last menstrual period as the basis of gestational age assignment». Ultrasound Obstet Gynecol1 (3): 212–9. doi:10.1046/j.1469-0705.1991.01030212.x. PMID12797075.