@article{10_4064_cm122_2_6,
     author = {Roberto Camporesi and Antonio J. Di Scala},
     title = {A generalization of a theorem of {Mammana}},
     journal = {Colloquium Mathematicum},
     pages = {215--223},
     publisher = {mathdoc},
     volume = {122},
     number = {2},
     year = {2011},
     doi = {10.4064/cm122-2-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm122-2-6/}
}