@article{Bellman_1970,
    doi = {10.1016/0025-5564(70)90132-x},
    url = {https://doi.org/10.1016%2F0025-5564%2870%2990132-x},
    year = {1970},
    month = {apr},
    publisher = {Elsevier {BV}},
    volume = {7},
    number = {3-4},
    pages = {329--339},
    author = {R. Bellman and K.J. {\AA}ström},
    title = {On structural identifiability},
    journal = {Mathematical Biosciences}
}

@article{Bellman_1970, doi = {10.1016/0025-5564(70)90132-x}, url = {https://doi.org/10.1016%2F0025-5564%2870%2990132-x}, year = {1970}, month = {apr}, publisher = {Elsevier {BV}}, volume = {7}, number = {3-4}, pages = {329--339}, author = {R. Bellman and K.J. {\AA}ström}, title = {On structural identifiability}, journal = {Mathematical Biosciences} }