@article{BUMI_1999_8_2B_3_a15,
     author = {Melfi, Giuseppe},
     title = {On $5$-tuples of twin practical numbers},
     journal = {Bollettino della Unione matematica italiana},
     pages = {723--734},
     publisher = {mathdoc},
     volume = {Ser. 8, 2B},
     number = {3},
     year = {1999},
     zbl = {0953.11004},
     mrnumber = {43117},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_1999_8_2B_3_a15/}
}