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    °Ñ¦Ò¸ê®Æ: Kirsti Andersen, Brook Taylor's Work on Linear Perspective, Springer-Verlag, (1992), p. 22, p. 235.

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    °Ñ¦Ò¸ê®Æ: Heinrich Doerrie: 100 Great Problems of   Elementary Mathematics, p.214.

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  • Monge Circle, Rev. Math. Sp. (1906-08) p. 174.
    Problem # 378 of Amer. Math. Monthly.

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    ¦³Ãö¥¿¥æ­y½u¤§°Q½×,¨£C. Zwikker, The Advanced Geometry of Plane Curves and Their Applications, Dover, pp.186-198. 

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    °Ñ¦Ò¸ê®Æ:  O.J. Ramler, The Orthopole Loci of Some One-Parameter Systems of Lines Referred to a Fixed Triangle, Amer. Math. Monthly 1930,
    pp. 130-136.

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    °Ñ¦Ò¸ê®Æ:  O.J. Ramler, The Orthopole Loci of Some One-Parameter Systems of Lines Referred to a Fixed Triangle, Amer. Math. Monthly 1930,
    pp. 130-136.

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    °Ñ¦Ò¸ê®Æ:  The Seven Circles Theorem and other New Theorems, p.12.