@article{van_der_Aalst_2011,
    doi = {10.1007/s00165-010-0161-4},
    url = {https://doi.org/10.1007%2Fs00165-010-0161-4},
    year = {2011},
    month = {may},
    publisher = {Association for Computing Machinery ({ACM})},
    volume = {23},
    number = {3},
    pages = {333--363},
    author = {W. M. P. van der Aalst and K. M. van Hee and A. H. M. ter Hofstede and N. Sidorova and H. M. W. Verbeek and M. Voorhoeve and M. T. Wynn},
    title = {Soundness of workflow nets: classification, decidability, and analysis},
    journal = {Formal Aspects of Computing}
}

@article{van_der_Aalst_2011, doi = {10.1007/s00165-010-0161-4}, url = {https://doi.org/10.1007%2Fs00165-010-0161-4}, year = {2011}, month = {may}, publisher = {Association for Computing Machinery ({ACM})}, volume = {23}, number = {3}, pages = {333--363}, author = {W. M. P. van der Aalst and K. M. van Hee and A. H. M. ter Hofstede and N. Sidorova and H. M. W. Verbeek and M. Voorhoeve and M. T. Wynn}, title = {Soundness of workflow nets: classification, decidability, and analysis}, journal = {Formal Aspects of Computing} }