@article{IJAMCS_2008_18_2_a7,
     author = {Respondek, J. S.},
     title = {Approximate controllability of infinite dimensional systems of the n-th order},
     journal = {International Journal of Applied Mathematics and Computer Science},
     pages = {199--212},
     publisher = {mathdoc},
     volume = {18},
     number = {2},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJAMCS_2008_18_2_a7/}
}