@article{KJM_2018_42_2_a4,
     author = {B. N. Onagh},
     title = {The {Harmonic} {Index} of {Edge-Semitotal} {Graphs,} {Total} {Graphs} and {Related} {Sums}},
     journal = {Kragujevac Journal of Mathematics},
     pages = {217 },
     publisher = {mathdoc},
     volume = {42},
     number = {2},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KJM_2018_42_2_a4/}
}