@article{10_4064_ap_50_1_37_52,
     author = {W{\l}adys{\l}aw Hejmo and Jacenty Kloch},
     title = {On the perturbations in a time-optimal closed-loop system},
     journal = {Annales Polonici Mathematici},
     pages = {37--52},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {1989},
     doi = {10.4064/ap-50-1-37-52},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-50-1-37-52/}
}