@article{KYB_1985_21_1_a5,
     author = {Datta, K. B.},
     title = {A new criterion for strong observability},
     journal = {Kybernetika},
     pages = {61--64},
     year = {1985},
     volume = {21},
     number = {1},
     mrnumber = {788669},
     zbl = {0556.93013},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1985_21_1_a5/}
}