@article{PIM_1993_N_S_53_67_a1,
     author = {Drago\v{s} Cvetkovi\'c and Slobodan K. Simi\'c},
     title = {Non-complete {Extended} {P-sum} of {Graphs,} {Graph} {Angles} and {Star} {Partitions}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {4 },
     publisher = {mathdoc},
     volume = {_N_S_53},
     number = {67},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1993_N_S_53_67_a1/}
}