Harry Falk, The Pātagaṇḍigūdem Copper-Plate Grant of the Ikṣvāku King Ehavala Cāntamūla, Silk Road Art and Archaeology, vol. 6 (1999-2000), pp. 275-283.
The name variously appears as Ehavala Chaṃtamula, Ehuvuja Chātamūla, Ehuvala Chātamūla, Ehuvala Siri Chāṃtamūla, etc. H.K. Narasimhaswami, Nagarjunikonda Image Inscription, Epigraphia Indica, vol. 29 (1951-52), pp. 137-139. This king is several times mentioned in 3rd century CE Nagarjunikonda inscriptions.
