A Robust Snake Implementation; A Dual Active Contour.

Steve R. Gunn Mark S. Nixon A Robust Snake Implementation; A Dual Active Contour. 63-68 1997 19 IEEE Trans. Pattern Anal. Mach. Intell. 1 http://www.computer.org/tpami/tp1997/i0063abs.htm db/journals/pami/pami19.html#GunnN97