Carl Olsson Martin Byröd Fredrik Kahl Globally Optimal Least Squares Solutions for Quasiconvex 1D Vision Problems. 686-695 2009 SCIA http://dx.doi.org/10.1007/978-3-642-02230-2_70 conf/scia/2009 db/conf/scia/scia2009.html#OlssonBK09