An ‘Umar Khayyám database. Jos Coumans.
In: The great ‘Umar Khayyám. Leiden, Leiden University Press, 2012. pp. 242–252.

Coumans studies Khayyám’s popularity worldwide, offering a methodology to establish a database to view all the information on the Rubáiyát, on the original Persian source, and on the secondary literature.