@article{RLIN_2001_9_12_1_a4,
     author = {Knops, Robin J. and Villaggio, Piero},
     title = {An elementary theory of the oblique impact of rods},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti Lincei. Matematica e applicazioni},
     pages = {49--56},
     publisher = {mathdoc},
     volume = {Ser. 9, 12},
     number = {1},
     year = {2001},
     zbl = {1170.74365},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RLIN_2001_9_12_1_a4/}
}