[1] B. D. Acharya, E. Sampathkumar, Graphoidal covers and graphoidal covering number of a graph, Indian J. Pure Appl. Math., 18, 10 (1987) 882-890. ⇒179, 180
[2] S. Arumugam, Path covers in graphs, Lecture Notes of the National Workshop on Decompositions of Graphs and Product Graphs held at Annamalai University, Tamil Nadu, January 3-7, 2006. ⇒179
[3] S. Arumugam, B. D. Acharya, E. Sampathkumar, Graphoidal Covers of a Graph: A Creative Review, Proc. National Workshop on Graph Theory and its Applications, Manonmaniam Sundaranar University, Tirunalveli, India, 1996, pp. 1-28. ⇒179
[5] S. Arumugam, I. Sahul Hamid, Label graphoidal covering number of a graph, Proc. Group Discussion on Labeling of Discrete Structures and Applications, Mary Matha Arts College, Mananthawady, Eds. B. D. Acharya, S. Arumugam and A.Rosa, Narosa Publishing House, 2007, pp. 77-82. ⇒180, 185, 187
[6] S. Arumugam, J. Suresh Suseela, Acyclic graphoidal covers and path partitions in a graph, Discrete Math., 190, 1-3 (1998), 67-77. ⇒17910.1016/S0012-365X(98)00032-6
[9] F. Harary, A. J. Schwenk, Evolution of the path number of a graph, covering and packing in graphs II, in: Graph Theory and Computing, Ed. R. C. Rad, Academic Press, New York, 1972, pp. 39-45. ⇒17910.1016/B978-1-4832-3187-7.50009-X
[10] K. Ratan Singh, P. K. Das, Induced acyclic graphoidal covers in a graph, World Academy of Science, Engineering and Technology, 68 (2010) 38-44. ⇒179