Mehrotra , P.K., Einarsson , B. and Nilsson , B.O. 1981. Ultrastructure of the Yolk Substance in Preimplantation Embryos of the Gerbil. Upsala Journal of Medical Sciences. 86, 3 (Sep. 1981), 233-236. DOI:https://doi.org/10.3109/03009738109179234.