@article{DMGT_2018_38_3_a13,
     author = {Stani\'c, Zoran},
     title = {Perturbations in a {Signed} {Graph} and its {Index}},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {841--852},
     publisher = {mathdoc},
     volume = {38},
     number = {3},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2018_38_3_a13/}
}