@inproceedings { LiuLakemeyer:IJCAI2009:LocalEffects,
        title = {On First-Order Definability and Computability of Progression for Local-Effect Actions and Beyond},
        booktitle = {Twenty-first International Joint Conference on Artificial Intelligence (IJCAI-09)},
        year = {2009},
        publisher = {AAAI Press},
        organization = {AAAI Press},
        url_Paper = {https://kbsg.rwth-aachen.de/sites/kbsg/files/LiuLak_LocalEffects_ijcai09.pdf},
        author = {Yongmei Liu and Lakemeyer, Gerhard}
}

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