A cryptic contact zone between divergent mitochondrial DNA lineages in southwestern North America supports past introgressive hybridization in the yellow-rumped warbler complex (Aves: Dendroica coronata)
Milá, B.; Toews, D. P.; Smith, T. B.; Wayne, R. K.
Biological Journal of the Linnean Society 103(3), 696–706, 2011.
