@techreport{iiasa4115,
           month = {September},
            type = {IIASA Working Paper},
           title = {Regulation of Oscillatory Systems Subjected to Viability Constraints},
         address = {IIASA, Laxenburg, Austria},
       publisher = {WP-94-096},
            year = {1994},
             url = {https://pure.iiasa.ac.at/id/eprint/4115/},
        abstract = {Regarding forcing terms of oscillatory systems of second-order differential equations as controls, we look for feedback (set-valued) maps governing the evolution of solutions satisfying viability of state constraints. We give a condition ensuring the existence of minimally forced solutions: the oscillation is unforced as long as viability is not at stake. Finally we compare "minimally forced oscillations" with free oscillations.},
          author = {Muellers, K.}
}