@article{ELMA_1994__49_1_141554,
     author = {Rainer Walden},
     title = {Optimale {Steuerungen.} {Eine} {Einf\"uhrung.}},
     journal = {Elemente der Mathematik},
     pages = {1--15},
     publisher = {mathdoc},
     volume = {49},
     number = {1},
     year = {1994},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1994__49_1_141554/}
}