Vielle, Christophe. “Ravivarman Kulasekhara the Yadava and Sagara the Son of Yadavi: Real and Ideal Kings in Matrilineal Kerala”. Religions of South Asia, vol. 5, no. 1-2, May 2012, pp. 365-87, https://doi.org/10.1558/rosa.v5i1/2.365.