@article{COCV_1997__2__329_0,
     author = {Colonius, F. and Johnson, R.},
     title = {Local and global null controllability of time varying linear control systems},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {329--341},
     publisher = {EDP-Sciences},
     volume = {2},
     year = {1997},
     mrnumber = {1487482},
     zbl = {0899.93004},
     language = {en},
     url = {http://www.numdam.org/item/COCV_1997__2__329_0/}
}