@article{05243028,
title = {Controllability of matrix second order systems: a trigonometric matrix approach.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2007},
year = {2007},
zbl = {1136.93311},
language = {en},
url = {http://dml.mathdoc.fr/item/05243028}
}
Sharma, Jaita Pankaj; George, Raju K. Controllability of matrix second order systems: a trigonometric matrix approach.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2007 (2007) . http://gdmltest.u-ga.fr/item/05243028/