Macmillan Education 2016, s.369 "From that time until the HAN dynasty the Ordos steppe was the home of semi-nomadic Indo-European peoples whose culture can be regarded as an eastern province of a vast Eurasian continuum of Scytho-Siberian cultures."
Harmatta 1992, s.348: "From the first millennium b.c., we have abundant historical, archaeological and linguistic sources for the location of the territory inhabited by the Iranian peoples. In this period the territory of the northern Iranians, they being equestrian nomads, extended over the whole zone of the steppes and the wooded steppes and even the semi-deserts from the Great Hungarian Plain to the Ordos in northern China."