@article{CC_2008_37_2_a6,
     author = {Kawski, Matthias and Maxwell, Parnell Ted},
     title = {Curvature of optimal control: {Deformation} of scalar-input planar systems},
     journal = {Control and Cybernetics},
     pages = {353--367},
     publisher = {mathdoc},
     volume = {37},
     number = {2},
     year = {2008},
     zbl = {1235.49047},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2008_37_2_a6/}
}