By chance I have to check books on the 'multi-state order' system in medieval Eurasia (mainly for the teaching), and Takashi Furumatsu, (relatively) young Japanese expert in Khitan-Liao history, often cites Franke and Standen among the European scholars on his field.

• Satoshi, Endō, 遠藤総史, Iiyama Tomoyasu, 飯山知保, Itō Kazuma, 伊藤一馬, Mori Eisuke, and 毛利英介. "Recent Japanese Scholarship on the Multi-State Order in East Eurasia from the Tenth to Thirteenth Centuries." Journal of Song-Yuan Studies 47 (2017): 193-205. Accessed June 4, 2021. https://www.jstor.org/stable/26572658.
• Franke, Herbert & Denis Twichett (eds.). The Cambridge History of China, vol. 6. Alien Regimes and Border States, 907–1368. Cambridge: Cambridge University Press, 1994.
• FURUMATSU, Takashi. 'The Border between Khitan and Song under the Chanyuan Treaty System'. Shirin (Kyoto Univ.) 90-1 (2007): 28-61. (in Japanese, but English summary)
• Standen, Naomi. Unbounded Loyalty: Frontier Crossings in Liao China. Honolulu: U of Hawaii Pr., 2006.
• ________. "Integration and Separation: The Framing of the Liao Dynasty (907—1125) in Chinese Sources." Asia Major, THIRD SERIES, 24, no. 2 (2011): 147-98. Accessed June 4, 2021. http://www.jstor.org/stable/41650013.