@article{GDZPPN00203042X, title = {Controllability of linear systems and a boundary value problem.}, journal = {Aequationes mathematicae}, volume = {15}, year = {1977}, pages = {81-92}, zbl = {0385.93006}, url = {http://dml.mathdoc.fr/item/GDZPPN00203042X} }
Hiris, V.; Megan, M. Controllability of linear systems and a boundary value problem.. Aequationes mathematicae, Tome 15 (1977) pp. 81-92. http://gdmltest.u-ga.fr/item/GDZPPN00203042X/