@article{Griffith_1971,
    title = {On the observability of nonlinear systems: I},
    volume = {35},
    issn = {0022-247X},
    url = {http://dx.doi.org/10.1016/0022-247X(71)90241-1},
    doi = {10.1016/0022-247x(71)90241-1},
    number = {1},
    journal = {Journal of Mathematical Analysis and Applications},
    publisher = {Elsevier BV},
    author = {Griffith, E. W. and Kumar, K. S. P.},
    year = {1971},
    month = {jul},
    pages = {135–147},
    date-added = {2025-5-6 16:52:16 +0100}
}

@article{Griffith_1971, title = {On the observability of nonlinear systems: I}, volume = {35}, issn = {0022-247X}, url = {http://dx.doi.org/10.1016/0022-247X(71)90241-1}, doi = {10.1016/0022-247x(71)90241-1}, number = {1}, journal = {Journal of Mathematical Analysis and Applications}, publisher = {Elsevier BV}, author = {Griffith, E. W. and Kumar, K. S. P.}, year = {1971}, month = {jul}, pages = {135–147}, date-added = {2025-5-6 16:52:16 +0100} }