BRAWAND, David, Walter Wahli, Henrik Kaessmann. Loss of Egg Yolk Genes in Mammals and the Origin of Lactation and Placentation. PLoS Biology. 2008-03, roč. 6, čís. 3, s. e63. Dostupné online [cit. 2008-08-29]. DOI10.1371/journal.pbio.0060063.
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BRAWAND, David, Walter Wahli, Henrik Kaessmann. Loss of Egg Yolk Genes in Mammals and the Origin of Lactation and Placentation. PLoS Biology. 2008-03, roč. 6, čís. 3, s. e63. Dostupné online [cit. 2008-08-29]. DOI10.1371/journal.pbio.0060063.