@article{IJAMCS_2016_26_3_a0,
     author = {Sikora, B.},
     title = {Controllability criteria for time-delay fractional systems with a retarded state},
     journal = {International Journal of Applied Mathematics and Computer Science},
     pages = {521--531},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IJAMCS_2016_26_3_a0/}
}