@article{PORMA_1975__34_2_115253,
     author = {Chukwu, Ethelbert N.},
     title = {On the reachable sets of non-autonomous linear control systems},
     journal = {Portugaliae mathematica},
     pages = {91--103},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1975},
     mrnumber = {0390893},
     zbl = {0321.93017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1975__34_2_115253/}
}