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Haag ES (2007). Why two sexes? Sex determination in multicellular organisms and protistan mating types. Seminars in Cell and Developmental Biology. 18 (3): 348—9. doi:10.1016/j.semcdb.2007.05.009. PMID17644371.
Stiglec R, Ezaz T, Graves JA (2007). A new look at the evolution of avian sex chromosomes. Cytogenet. Genome Res. 117 (1–4): 103—109. doi:10.1159/000103170. PMID17675850.
Grützner, F.; Rens, W., Tsend-Ayush, E., El-Mogharbel, N., O'Brien, P.C.M., Jones, R.C., Ferguson-Smith, M.A. and Marshall, J.A. (2004). In the platypus a meiotic chain of ten sex chromosomes shares genes with the bird Z and mammal X chromosomes. Nature. 432 (7019): 913—917. doi:10.1038/nature03021. PMID15502814.
Smith CA, Katza M, Sinclair AH (2003). DMRT1 Is Upregulated in the Gonads During Female-to-Male Sex Reversal in ZW Chicken Embryos. Biology of Reproduction. 68 (2): 560—570. doi:10.1095/biolreprod.102.007294. PMID12533420.