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    "    Theory, 6, p.50-62, 1972.",
    ".. [2] M. G. Cox, \"The numerical evaluation of b-splines\", J. Inst. Maths",
    "    Applics, 10, p.134-149, 1972.",
    ".. [3] P. Dierckx, \"Curve and surface fitting with splines\", Monographs",
    "    on Numerical Analysis, Oxford University Press, 1993."
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