@article{TUW-189865, author = {Graichen, Knut and Kugi, Andreas and Petit, Nicolas and Chaplais, Francois}, title = {Handling constraints in optimal control with saturation functions and system extension}, journal = {Systems {\&} Control Letters}, year = {2010}, volume = {59}, pages = {671--679}, doi = {10.1016/j.sysconle.2010.08.003} }