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@article{GMJ_1994__1_1_47153, author = {Lions, J.L.}, title = {Measures of controllability.}, journal = {Georgian Mathematical Journal}, pages = {47--52}, publisher = {mathdoc}, volume = {1}, number = {1}, year = {1994}, zbl = {0812.93046}, language = {en}, url = {http://geodesic.mathdoc.fr/item/GMJ_1994__1_1_47153/} }
Lions, J.L. Measures of controllability.. Georgian Mathematical Journal, Tome 1 (1994) no. 1, pp. 47-52. http://geodesic.mathdoc.fr/item/GMJ_1994__1_1_47153/