Saputro, S. W., A. Semanicova-Fenovc, M. Baca, and M. Lascsakova. “On Fractional Metric Dimension of Comb Product Graphs”. Statistics, Optimization & Information Computing, Vol. 6, no. 1, Feb. 2018, pp. 150-8, doi:10.19139/soic.v6i1.473.