Biarcs and bilens

Bartoň, 2011, Spiral fat arcs — Bounding regions with cubic convergence, Graph. Models, 73, 50, 10.1016/j.gmod.2010.10.005 Bolton, 1975, Biarc curves, Comput.-Aided Design, 7, 89, 10.1016/0010-4485(75)90086-X Kurnosenko, 2001, Interpolational properties of planar spiral curves, Fund. and Applied Math., 7, 441 Kurnosenko, 2009, General properties of spiral plane curves, J. Math. Sci., 161, 405, 10.1007/s10958-009-9566-0 Kurnosenko, 2010, Applying inversion to construct planar, rational, spiral curves that satisfy two-point G2 Hermite data, Comput. Aided Geom. Design, 27, 262, 10.1016/j.cagd.2009.12.004 Kurnosenko, 2010, Two-point G2 Hermite interpolation with spirals by inversion of hyperbola, Comput. Aided Geom. Design, 27, 474, 10.1016/j.cagd.2010.03.001 Kurnosenko, 2011, Short spirals, J. Math. Sci., 175, 517, 10.1007/s10958-011-0361-3 Kurnosenko, 2011, Long spirals, J. Math. Sci., 175, 523, 10.1007/s10958-011-0362-2 Meek, 2008, The family of biarcs that matches planar, two-point G1 Hermite data, J. Comput. Appl. Math., 212, 31, 10.1016/j.cam.2006.11.018 Nutbourne, 1988, Differential Geometry Applied to Curve and Surface Design, vol. 1 Sabitov, 2010, Approximation of plane curves by circular arcs, Comput. Math. Math. Phys., 50, 1279, 10.1134/S0965542510080014 Yong, 1999, A note on approximation of discrete data by G1 arc splines, Comput.-Aided Design, 31, 911, 10.1016/S0010-4485(99)00076-7