@article{KJM_2020_44_4_a5,
     author = {I. Gutman and M. Mateji\'c and E. Milovanovi\'c and I. Milovanovi\'c},
     title = {Lower {Bounds} for {Inverse} {Sum} {Indeg} {Index} of {Graphs}},
     journal = {Kragujevac Journal of Mathematics},
     pages = {551 },
     publisher = {mathdoc},
     volume = {44},
     number = {4},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KJM_2020_44_4_a5/}
}