@article{PIM2_1993__53(67)_258556,
     author = {Cvetkovi\'c, Drago\v{s} and Simi\'c, Slobodan},
     title = {Non-complete extended -sum of graphs, graph angles and star partitions.},
     journal = {Publications de l 'Institut Math\'ematique. Nouvelle S\'erie},
     pages = {4},
     publisher = {mathdoc},
     volume = {53(67)},
     year = {1993},
     zbl = {0795.05093},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/PIM2_1993__53(67)_258556/}
}