Voir la notice de l'article provenant de la source European Digital Mathematics Library
@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/} }
Chukwu, Ethelbert N. On the reachable sets of non-autonomous linear control systems. Portugaliae mathematica, Tome 34 (1975) no. 2, pp. 91-103. http://geodesic.mathdoc.fr/item/PORMA_1975__34_2_115253/