มุมกวาดเยื้องศูนย์กลาง (Thai Wikipedia)

Analysis of information sources in references of the Wikipedia article "มุมกวาดเยื้องศูนย์กลาง" in Thai language version.

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George Albert Wentworth (1914). "The ellipse §126". Elements of analytic geometry (2nd ed.). Ginn & Co. p. 141.