@incollection{Aalst_1997,
    doi = {10.1007/3-540-63139-9_48},
    url = {https://doi.org/10.1007%2F3-540-63139-9_48},
    year = {1997},
    publisher = {Springer Berlin Heidelberg},
    pages = {407--426},
    author = {W. M. P. Aalst},
    title = {Verification of workflow nets},
    booktitle = {Application and Theory of Petri Nets 1997}
}

@incollection{Aalst_1997, doi = {10.1007/3-540-63139-9_48}, url = {https://doi.org/10.1007%2F3-540-63139-9_48}, year = {1997}, publisher = {Springer Berlin Heidelberg}, pages = {407--426}, author = {W. M. P. Aalst}, title = {Verification of workflow nets}, booktitle = {Application and Theory of Petri Nets 1997} }