Certain chromatic sums of some cycle-related graph classes. - N. K. Sudev; K. P. Chithra; Johan Kok (Discret. Math. Algorithms Appl., 2016)

A study on the injective coloring parameters of certain graphs. - N. K. Sudev; K. P. Chithra; S. Satheesh; Johan Kok (Discret. Math. Algorithms Appl., 2016)

On chromatic Zagreb indices of certain graphs. - Johan Kok; N. K. Sudev; U. Mary (Discret. Math. Algorithms Appl., 2017)

On certain parameters of equitable coloring of graphs. - Sudev Naduvath; K. P. Chithra; S. Satheesh; Johan Kok (Discret. Math. Algorithms Appl., 2017)

On certain coloring parameters of Mycielski graphs of some graphs. - N. K. Sudev; K. P. Chithra; K. Augustine Germina; S. Satheesh; Johan Kok (Discret. Math. Algorithms Appl., 2018)

Tattooing and the Tattoo Number of Graphs. - Johan Kok; Sudev Naduvath (J. Interconnect. Networks, 2020)

A Study on Ornated Graphs. - Johan Kok; Sudev Naduvath; Vivian Mukungunugwa (J. Interconnect. Networks, 2023)

Cyclic property of iterative eccentrication of a graph. - Manakkulam Rohith Raja; Johan Kok; Tabitha Agnes Mangam; Sudev Naduvath (Discret. Math. Algorithms Appl., 2023)

A Study on Exact Deg-Centric Graphs of Graphs. - Timmy Tomy Thalavayalil; Johan Kok; Sudev Naduvath (J. Interconnect. Networks, 2025)