Franken, C.; Rohland, H.; Block-Berlitz, M.; Batbayar, T.; Erdenebat, U. Remote Sensing of Large-Scale Areas at the Urban Sites of the Mongolian Orkhon Valley Using Low-Cost Drones. Preliminary Results and Some Thoughts on the Urban Layout of the Uyghur Capital Qara Balǧasun. JoGA 2020, 1–28 (§).