@article{Bell_2016,
    doi = {10.1016/j.tcs.2016.09.003},
    url = {https://doi.org/10.1016%2Fj.tcs.2016.09.003},
    year = {2016},
    month = {nov},
    publisher = {Elsevier {BV}},
    volume = {652},
    pages = {47--63},
    author = {Paul C. Bell and Shang Chen and Lisa Jackson},
    title = {On the decidability and complexity of problems for restricted hierarchical hybrid systems},
    journal = {Theoretical Computer Science}
}

@article{Bell_2016, doi = {10.1016/j.tcs.2016.09.003}, url = {https://doi.org/10.1016%2Fj.tcs.2016.09.003}, year = {2016}, month = {nov}, publisher = {Elsevier {BV}}, volume = {652}, pages = {47--63}, author = {Paul C. Bell and Shang Chen and Lisa Jackson}, title = {On the decidability and complexity of problems for restricted hierarchical hybrid systems}, journal = {Theoretical Computer Science} }