@article{10_4064_ap_28_1_53_55,
     author = {A. Plis},
     title = {Accessible sets for a control system},
     journal = {Annales Polonici Mathematici},
     pages = {53--55},
     publisher = {mathdoc},
     volume = {28},
     number = {1},
     year = {1973},
     doi = {10.4064/ap-28-1-53-55},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-28-1-53-55/}
}