@article{NUMA_1990__57_6-7_133452,
     author = {Jochen W. Schmidt and Isa Scholz},
     title = {A {Dual} {Algorithm} for {Convex-Concave} {Data} {Smoothing} by {Cubic} {C2-Splines.}},
     journal = {Numerische Mathematik},
     pages = {333--350},
     publisher = {mathdoc},
     volume = {57},
     number = {6-7},
     year = {1990},
     zbl = {0702.65017},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1990__57_6-7_133452/}
}