[Demiéville 1953] Demiéville, Paul. “Les sources chinoises.” In L’Inde classique: Manuel des études indiennes, Tome II, by Louis Renou and Jean Filliozat, 398-463. Paris: Imprimerie Nationale/Hanoi: École Française d’Extrême-Orient, 1953.
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Demiéville mentions in passing that the Shiqi di lun was extant in Xuanzang's time, and says that it was in order to study the original text that Xuanzang is supposed to have departed for India around 627.