Population genetics and morphological comparisons of migratory European (Hirundo rustica rustica) and sedentary East-Mediterranean (Hirundo rustica transitiva) barn swallows.
Dor R, Safran RJ, Vortman Y, Lotem A, McGowan A, Evans MR, Lovette IJ. Population genetics and morphological comparisons of migratory European (Hirundo rustica rustica) and sedentary East-Mediterranean (Hirundo rustica transitiva) barn swallows. J Hered. 2012 Jan-Feb; 103(1):55-63.