@book{ BA21280204,
 author = "Gries, David and Schneider, Fred B.",
 title = "A logical approach to discrete math",
 publisher = "Springer-Verlag",
 year = "1993",
 series = "Texts and monographs in computer science",
 number = "",
 URL = "https://ci.nii.ac.jp/ncid/BA21280204"
}
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