@article{10_4064_sm_45_2_161_171,
     author = {J. Zabczyk},
     title = {Optimal control by means switchings},
     journal = {Studia Mathematica},
     pages = {161--171},
     year = {1973},
     volume = {45},
     number = {2},
     doi = {10.4064/sm-45-2-161-171},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-45-2-161-171/}
}