@article{Gray_2019,
    title = {Relative degree of interconnected SISO nonlinear control systems},
    volume = {124},
    issn = {0167-6911},
    url = {http://dx.doi.org/10.1016/j.sysconle.2018.12.011},
    doi = {10.1016/j.sysconle.2018.12.011},
    journal = {Systems {\&} Control Letters},
    publisher = {Elsevier BV},
    author = {Gray, W. Steven and Venkatesh, G.S.},
    year = {2019},
    month = {feb},
    pages = {99–105},
    date-added = {2025-3-13 8:8:7 +0100}
}

@article{Gray_2019, title = {Relative degree of interconnected SISO nonlinear control systems}, volume = {124}, issn = {0167-6911}, url = {http://dx.doi.org/10.1016/j.sysconle.2018.12.011}, doi = {10.1016/j.sysconle.2018.12.011}, journal = {Systems {\&} Control Letters}, publisher = {Elsevier BV}, author = {Gray, W. Steven and Venkatesh, G.S.}, year = {2019}, month = {feb}, pages = {99–105}, date-added = {2025-3-13 8:8:7 +0100} }