@article{CC_2009_38_4B_a11,
     author = {Ledzewicz, Urszula and Sch\"attler, Heinz},
     title = {Singular controls and chattering arcs in optimal control problems arising in biomedicine},
     journal = {Control and Cybernetics},
     pages = {1501--1523},
     publisher = {mathdoc},
     volume = {38},
     number = {4B},
     year = {2009},
     zbl = {1236.49054},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2009_38_4B_a11/}
}