References 1 and 2 are incorrect. The correct references are listed here:
Martin SH, Dasmahapatra KK, Nadeau NJ, Salazar C, Walters JR, et al. (2013) Genome-wide evidence for speciation with gene flow in Heliconius butterflies. Genome Res 23: 1817–1828.
Ellegren H, Smeds L, Burri R, Olason PI, Backstrom N, et al. (2012) The genomic landscape of species divergence in Ficedula flycatchers. Nature 491: 756–760.
Reference
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