@article{BUMI_1999_8_2B_2_a15,
     author = {Troi, G. and Zannier, U.},
     title = {Note on the density constant in the distribution of self-numbers. {II}},
     journal = {Bollettino della Unione matematica italiana},
     pages = {397--399},
     publisher = {mathdoc},
     volume = {Ser. 8, 2B},
     number = {2},
     year = {1999},
     zbl = {1003.11035},
     mrnumber = {1692189},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1999_8_2B_2_a15/}
}