@article{Orzan_2010,
    doi = {10.1016/j.tcs.2009.11.001},
    url = {https://doi.org/10.1016%2Fj.tcs.2009.11.001},
    year = {2010},
    month = {mar},
    publisher = {Elsevier {BV}},
    volume = {411},
    number = {11-13},
    pages = {1338--1371},
    author = {Simona Orzan and Tim A.C. Willemse},
    title = {Invariants for Parameterised Boolean Equation Systems},
    journal = {Theoretical Computer Science}
}

@article{Orzan_2010, doi = {10.1016/j.tcs.2009.11.001}, url = {https://doi.org/10.1016%2Fj.tcs.2009.11.001}, year = {2010}, month = {mar}, publisher = {Elsevier {BV}}, volume = {411}, number = {11-13}, pages = {1338--1371}, author = {Simona Orzan and Tim A.C. Willemse}, title = {Invariants for Parameterised Boolean Equation Systems}, journal = {Theoretical Computer Science} }