@article{Kou_1973,
    title = {Observability of nonlinear systems},
    volume = {22},
    issn = {0019-9958},
    url = {http://dx.doi.org/10.1016/S0019-9958(73)90508-1},
    doi = {10.1016/s0019-9958(73)90508-1},
    number = {1},
    journal = {Information and Control},
    publisher = {Elsevier BV},
    author = {Kou, Shauying R. and Elliott, David L. and Tarn, Tzyh Jong},
    year = {1973},
    month = {feb},
    pages = {89–99},
    date-added = {2026-3-27 15:9:36 +0100}
}

@article{Kou_1973, title = {Observability of nonlinear systems}, volume = {22}, issn = {0019-9958}, url = {http://dx.doi.org/10.1016/S0019-9958(73)90508-1}, doi = {10.1016/s0019-9958(73)90508-1}, number = {1}, journal = {Information and Control}, publisher = {Elsevier BV}, author = {Kou, Shauying R. and Elliott, David L. and Tarn, Tzyh Jong}, year = {1973}, month = {feb}, pages = {89–99}, date-added = {2026-3-27 15:9:36 +0100} }