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Oren-Benaroya, R.; Orvieto, R.; Gakamsky, A.; Pinchasov, M.; Eisenbach, M. (8 de julio de 2008). «The sperm chemoattractant secreted from human cumulus cells is progesterone». Human Reproduction23 (10): 2339-2345. PMID18621752. doi:10.1093/humrep/den265.
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Geirsson, R. T. (1 de mayo de 1991). «Ultrasound instead of last menstrual period as the basis of gestational age assignment». Ultrasound in Obstetrics and Gynecology1 (3): 212-219. PMID12797075. doi:10.1046/j.1469-0705.1991.01030212.x.
Oren-Benaroya, R.; Orvieto, R.; Gakamsky, A.; Pinchasov, M.; Eisenbach, M. (8 de julio de 2008). «The sperm chemoattractant secreted from human cumulus cells is progesterone». Human Reproduction23 (10): 2339-2345. PMID18621752. doi:10.1093/humrep/den265.
Robinson, H. P.; Fleming, J.E.E. (September 1975). «A critical evaluation of sonar 'crown‐rump length' measurements». BJOG: An International Journal of Obstetrics and Gynaecology82 (9): 702-710. PMID1182090. doi:10.1111/j.1471-0528.1975.tb00710.x.
Geirsson, R. T. (1 de mayo de 1991). «Ultrasound instead of last menstrual period as the basis of gestational age assignment». Ultrasound in Obstetrics and Gynecology1 (3): 212-219. PMID12797075. doi:10.1046/j.1469-0705.1991.01030212.x.