Analysis of information sources in references of the Wikipedia article "Тюркский каганат" in Russian language version.
The Sogdian inscription of Bugut in Mongolia (see Volume III, pp. 342-3), written shortly after 581, shows that Sogdian was an official language of the First Türk empire centred on the Orkhon river in Mongolia.
The Sogdian inscription of Bugut in Mongolia (see Volume III, pp. 342-3), written shortly after 581, shows that Sogdian was an official language of the First Türk empire centred on the Orkhon river in Mongolia.