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    ".. [1] Paul Dierckx, Algorithms for smoothing data with periodic and parametric",
    "       splines, Computer Graphics and Image Processing, vol. 20, p. 171 (1982).",
    "       :doi:`10.1016/0146-664X(82)90043-0`",
    "",
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    "    http://www.uio.no/studier/emner/matnat/ifi/INF-MAT5340/v05/undervisningsmateriale/"
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