Boundaries and clines in the West Eurasian Y-chromosome landscape: insights from the European part of Russia.
Fechner A, Quinque D, Rychkov S, Morozowa I, Naumova O, Schneider Y, Willuweit S, Zhukova O, Roewer L, Stoneking M, et al. Am J Phys Anthropol. 2008 Sep; 137(1):41-7.