The earliest collections of O. Khayyam. V. Minorsky.
In: Yádníme-ye Jan Rypka 1967. Collection of articles on Persian and Tajik literature. Prague, Academia; The Hague, Paris, Mouton & Co., 1967. pp. 107-118.

When in 1949—52 the three anthologies of Omar Khayyam dated 604/1208, 613/1216 and 658/1259 appeared in quick succession in the West it was quite natural to hail them as our guides for establishing the much discussed poetical heritage of Khayyam.