Sims-Williams recently worked on a dedicatory Sogdian inscription, dated to the 1st-3rd centuries CE, that was discovered at Kultobe in Kazakhstan. It alludes to military operations of the principal towns of Sogdiana against the nomads in the north. The inscription tends to confirm the confederational organization of the Kangju state and its various allies that was known previously from the Chinese texts.
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"Some Bactrian seal-inscriptions" in "Afghanistan, ancien carrefour entre l'est et l'ouest" BREPOLS ISBN 2-503-51681-5
Nicholas Sims-Williams and Franz Grenet, The Sogdian Inscriptions of Kultobe,Shygys (Almaty), 2006, pp. 95-111.
Nicholas Sims-Williams, Franz Grenet, and Alexandr N. Podushkin, Les plus anciens monuments de la langue sogdienne: les inscriptions de Kultobe au Kazakhstan, Compte-rendus de l’Académie des Inscriptions et Belles-Lettres, 2007  pp. 1005, 1025-1033.