S.G. Klyashtorny, "Ancient Turk Rock Inscriptions in the Talas Ala-Too. A Sogdian Word in an Old Turk Inscription", Webfestschrift Marshak 2003, (Online Article).
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Tongdian vol. 200: "拔悉彌一名弊剌國,隋時聞焉" tr. "Basmyls, another name is Bila state, known in Sui time then." [1] (in Chinese)