@article{Doo_Yong_Lee_1994,
    doi = {10.1109/70.282537},
    url = {https://doi.org/10.1109%2F70.282537},
    year = {1994},
    month = {apr},
    publisher = {Institute of Electrical and Electronics Engineers ({IEEE})},
    volume = {10},
    number = {2},
    pages = {123--132},
    author = {Doo Yong Lee and F. DiCesare},
    title = {Scheduling flexible manufacturing systems using Petri nets and heuristic search},
    journal = {{IEEE} Transactions on Robotics and Automation}
}

@article{Doo_Yong_Lee_1994, doi = {10.1109/70.282537}, url = {https://doi.org/10.1109%2F70.282537}, year = {1994}, month = {apr}, publisher = {Institute of Electrical and Electronics Engineers ({IEEE})}, volume = {10}, number = {2}, pages = {123--132}, author = {Doo Yong Lee and F. DiCesare}, title = {Scheduling flexible manufacturing systems using Petri nets and heuristic search}, journal = {{IEEE} Transactions on Robotics and Automation} }