@book{ BB28033211,
 author = "Clemens, C. Herbert (Charles Herbert)",
 title = "Two-dimensional geometries : a problem-solving approach",
 publisher = "American Mathematical Society",
 year = "2019",
 series = "The Sally series",
 number = ". Pure and applied undergraduate texts ; 34",
 URL = "https://ci.nii.ac.jp/ncid/BB28033211"
}
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