@article{PIM_1980_N_S_27_41_a10,
     author = {Ivan Gutman},
     title = {Characteristics {And} {Maching} {Polynomials} {Of} {Some} {Compound} {Graphs}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {61 },
     publisher = {mathdoc},
     volume = {_N_S_27},
     number = {41},
     year = {1980},
     url = {http://geodesic.mathdoc.fr/item/PIM_1980_N_S_27_41_a10/}
}