@incollection{van_Hee_2007,
    doi = {10.1007/978-3-540-70881-0_21},
    url = {https://doi.org/10.1007%2F978-3-540-70881-0_21},
    year = {2007},
    publisher = {Springer Berlin Heidelberg},
    pages = {235--247},
    author = {Kees van Hee and Olivia Oanea and Natalia Sidorova and Marc Voorhoeve},
    title = {Verifying Generalized Soundness of Workflow Nets},
    booktitle = {Perspectives of Systems Informatics}
}

@incollection{van_Hee_2007, doi = {10.1007/978-3-540-70881-0_21}, url = {https://doi.org/10.1007%2F978-3-540-70881-0_21}, year = {2007}, publisher = {Springer Berlin Heidelberg}, pages = {235--247}, author = {Kees van Hee and Olivia Oanea and Natalia Sidorova and Marc Voorhoeve}, title = {Verifying Generalized Soundness of Workflow Nets}, booktitle = {Perspectives of Systems Informatics} }