@article{Fliess_1981d,
    title = {The unobservability ideal for nonlinear systems},
    volume = {26},
    issn = {0018-9286},
    url = {http://dx.doi.org/10.1109/tac.1981.1102659},
    doi = {10.1109/tac.1981.1102659},
    number = {2},
    journal = {IEEE Transactions on Automatic Control},
    publisher = {Institute of Electrical and Electronics Engineers (IEEE)},
    author = {Fliess, M.},
    year = {1981},
    month = {apr},
    pages = {592–593},
    date-added = {2025-5-6 10:21:31 +0100}
}

@article{Fliess_1981d, title = {The unobservability ideal for nonlinear systems}, volume = {26}, issn = {0018-9286}, url = {http://dx.doi.org/10.1109/tac.1981.1102659}, doi = {10.1109/tac.1981.1102659}, number = {2}, journal = {IEEE Transactions on Automatic Control}, publisher = {Institute of Electrical and Electronics Engineers (IEEE)}, author = {Fliess, M.}, year = {1981}, month = {apr}, pages = {592–593}, date-added = {2025-5-6 10:21:31 +0100} }