@article{KYB_1995_31_6_a1,
     author = {Eliopoulou, Helen and Karcanias, Nicos},
     title = {Properties of reachability and almost reachability subspaces of implicit systems: {The} extension problem},
     journal = {Kybernetika},
     pages = {530--540},
     year = {1995},
     volume = {31},
     number = {6},
     mrnumber = {1374142},
     zbl = {0864.93022},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1995_31_6_a1/}
}