@article{Lyzell_2011,
    doi = {10.1016/j.automatica.2011.06.013},
    url = {https://doi.org/10.1016%2Fj.automatica.2011.06.013},
    year = {2011},
    month = {sep},
    publisher = {Elsevier {BV}},
    volume = {47},
    number = {9},
    pages = {1896--1904},
    author = {Christian Lyzell and Torkel Glad and Martin Enqvist and Lennart Ljung},
    title = {Difference algebra and system identification},
    journal = {Automatica}
}

@article{Lyzell_2011, doi = {10.1016/j.automatica.2011.06.013}, url = {https://doi.org/10.1016%2Fj.automatica.2011.06.013}, year = {2011}, month = {sep}, publisher = {Elsevier {BV}}, volume = {47}, number = {9}, pages = {1896--1904}, author = {Christian Lyzell and Torkel Glad and Martin Enqvist and Lennart Ljung}, title = {Difference algebra and system identification}, journal = {Automatica} }