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    ".. [1] W. Boehm, \"Inserting new knots into b-spline curves.\",",
    "    Computer Aided Design, 12, p.199-201, 1980.",
    "    :doi:`10.1016/0010-4485(80)90154-2`.",
    ".. [2] P. Dierckx, \"Curve and surface fitting with splines, Monographs on",
    "    Numerical Analysis\", Oxford University Press, 1993."
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