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@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/} }
Melfi, Giuseppe. On $5$-tuples of twin practical numbers. Bollettino della Unione matematica italiana, Série 8, 2B (1999) no. 3, pp. 723-734. http://geodesic.mathdoc.fr/item/BUMI_1999_8_2B_3_a15/
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