@article{PIM_1992_N_S_52_66_a1,
     author = {Ivan Gutman},
     title = {Independent {Vertex} {Sets} in {Some} {Compound} {Graphs}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {5 },
     year = {1992},
     volume = {_N_S_52},
     number = {66},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1992_N_S_52_66_a1/}
}