@article{MZ_1968__107_171068,
     author = {Rodolfo De Sapio},
     title = {Disc and {Sphere} {Bundles} {Over} {Homotopy} {Spheres.}},
     journal = {Mathematische Zeitschrift},
     pages = {232--236},
     publisher = {mathdoc},
     volume = {107},
     year = {1968},
     zbl = {0162.55302},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__107_171068/}
}