"Particularly important is the seal of Khiṅgila, where the portrait of the seated king is accompanied by a Bactrian inscription giving the name of this Hunnish leader, whose chronological position between Kidarites and Hephthalites is confirmed by an analysis of iconography and style (Callieri, 2002)" in Callieri, Pierfrancesco. "SEALS AND SEALINGS – Encyclopaedia Iranica". www.iranicaonline.org.