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O'Rahilly R: Developmental Stages in Human Embryos; Embryos of the First Three Weeks. Washington, DC, Carnegie Institution of Washington, 1973 [taken from The Developing Human, K Moore (ed). Philadelphia, WB Saunders, 1977]
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Tejada, R.I., Karow, W.G. Semantics used in the nomenclature of in vitro fertilization, or let's all be more proper. J Assist Reprod Genet 3, 341–342 (1986). https://doi.org/10.1007/BF01133243
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DOI: https://doi.org/10.1007/BF01133243