@article{KYB_1989_25_4_a0,
     author = {Guidorzi, Roberto P.},
     title = {Equivalence, invariance and dynamical system canonical modelling. {I.} {Invariant} properties of observable models and associated transformations},
     journal = {Kybernetika},
     pages = {233--257},
     year = {1989},
     volume = {25},
     number = {4},
     mrnumber = {1015030},
     zbl = {0691.93006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1989_25_4_a0/}
}