@article{MASLO_2002__52_4_a3,
     author = {El-Saify, Hussain A. and Bahaa, G. M.},
     title = {Optimal control for $n\times n$ hyperbolic systems involving operators of infinite order},
     journal = {Mathematica slovaca},
     pages = {409--424},
     publisher = {mathdoc},
     volume = {52},
     number = {4},
     year = {2002},
     mrnumber = {1940245},
     zbl = {1016.49003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_2002__52_4_a3/}
}