Natarajan, C., and S. K. Ayyaswamy. “A Note on the Chromatic Transversal Domination Number of a Class of Graphs”. The Journal of the Indian Mathematical Society, vol. 83, no. 3-4, Dec. 2016, pp. 323–328, https://informaticsjournals.co.in/index.php/jims/article/view/6612.