@article{PIM_1976_N_S_20_34_a15,
     author = {G. Hetzer and V. Stallbohm},
     title = {Coincidence {Degree} {And} {Rabinowitz's} {Bifurcation} {Theorem}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {117 },
     publisher = {mathdoc},
     volume = {_N_S_20},
     number = {34},
     year = {1976},
     url = {http://geodesic.mathdoc.fr/item/PIM_1976_N_S_20_34_a15/}
}