(M. A. Rajan and Ranjini. P. S) On Study Of Vertex Labeling Graph Operations, Journal of scientific research, Bangaladesh J. Sci. Res. 3 (2), 303-309 (2011).
(M. A. Rajan and Ranjini. P.S) On Some Properties of Splitting of Graphs Antarctica Journal of Mathematics, 8 (2)(2011) 103-108. ISSN: 0972-8643.
( K. M. Nagaraja Naveen kumar B and Y.D Wu), Schur convexity of Gnan mean for two variables, Notes on Number theory and discrete mathematics, Bulgaria17(4) (2011) 37-41, ISSN 1310-5132.
( K. M. Nagaraja Naveen kumar B and Sandeep Kumar), Solution to open problem by J. Rooin, Notes on Number theory and discrete mathematics, Bulgaria 17(4)(2011), 33–36 ISSN 1310-5132.
(Ranjini P. S) On the Bounds of the largest eigen value and the Laplacian energy of certain class of graphs, Scientia Magna,vol. 6 (3) (2011) 13-17. ISSN: 1556-6706,