On composition of signed graphs. - K. Augustine Germina; Koombail Shahul Hameed (Discuss. Math. Graph Theory, 2012)

On co-regular signed graphs. - Koombail Shahul Hameed; Viji Paul; K. Augustine Germina (Australas. J Comb., 2015)

On two Laplacian matrices for skew gain graphs. - Roshni T. Roy; Koombail Shahul Hameed; K. Augustine Germina (Electron. J. Graph Theory Appl., 2021)