@book{ BB02007023,
 author = "Dudley, Underwood",
 title = "A guide to elementary number theory",
 publisher = "Mathematical Association of America",
 year = "2009",
 series = "The Dolciani mathematical expositions",
 number = "41",
 URL = "https://ci.nii.ac.jp/ncid/BB02007023"
}
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