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[1] E. H. Lockwood, A Book of Curves, (1 nd), University Press, 1961 [2] Howard Eves, A Survery of Geometry, Volume One, Allyn and Bacon, Inc., 1963, U.S.A. [3] Luigi Cremona, Elements of Projective Geometry, Translated by Charles Leudesdorf, M.A., (3 nd), Dove Publications, Inc.,1960, New York
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