[McRae 2017] McRae, John R. “Glimmerings of India: Nukariya Kaiten 忽滑谷快天 and the Transmission of Zen from India to China.” In Buddhist Transformations and Interactions: Essays in Honor of Antonino Forte, edited by Victor H. Mair, 180-234. Amherst, NY: Cambria Press, 2017.
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McRae briefly notes that already in 1905, Nukariya Kaiten had "argue[d] from quite a number of perspectives that [X26, X27] is apocryphal." This text is significant because it is the basis for the story that the Buddha transmitted the Dharma to Mahākāśyapa by holding up a flower, at which Mahākāśyapa signalled his understanding by smiling, 拈花微笑. McRae is here summarising Nukariya's Zengaku hihanron 禪學批判論 (Tokyo: Komeisha, 1905).
[X] X = Xuzang jing. Shinsan dai Nippon zokuzōkyō (卍新纂大日本續藏經). Edited by Kawamura Kōshō 河村孝照; Nishi Giyū 西義雄, and Tamaki Kōshirō 玉城康四郎. Tōkyō : Kokusho Kankōkai, Shōwa 50-Heisei 1 [1975-1989]. Originally published by the Dai Nihon zoku Zōkyō. Kyōto : Zōkyō Shoin, 1905-1912. Version of the Chinese Buddhist Electronic Text Association (CBETA).