@article{PIM_1991_N_S_50_64_a3,
     author = {Ivan Gutman},
     title = {An {Identity} for the {Independence} {Polynomials} of {Trees}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {19 },
     publisher = {mathdoc},
     volume = {_N_S_50},
     number = {64},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1991_N_S_50_64_a3/}
}