@article{MM2_1980__33_154743,
     author = {Franco Ghione and Gianni Sacchiero},
     title = {Normal {Bundles} of {Rational} {Curves} in ...3.},
     journal = {Manuscripta mathematica},
     pages = {111--128},
     publisher = {mathdoc},
     volume = {33},
     year = {1980},
     zbl = {0496.14021},
     url = {http://geodesic.mathdoc.fr/item/MM2_1980__33_154743/}
}