Could you please provide any references for the refutation? I vaguely remember coming across a study based on genetics that implied the flow of migration was p

Could you please provide any references for the refutation? I vaguely remember coming across a study based on genetics that implied the flow of migration was probably from east to west. FWIW, I find it amusing that the term used is Invasion and not Migration. Reminds me of the asymmetric application of the term expat instead of immigrant when people move to different countries.