@incollection{Ibarra_1993,
    doi = {10.1007/3-540-56939-1_82},
    url = {https://doi.org/10.1007%2F3-540-56939-1_82},
    year = {1993},
    publisher = {Springer Berlin Heidelberg},
    pages = {313--324},
    author = {Oscar H. Ibarra and Tao Jiang and Nicholas Tran and Hui Wang},
    title = {New decidability results concerning two-way counter machines and applications},
    booktitle = {Automata, Languages and Programming}
}

@incollection{Ibarra_1993, doi = {10.1007/3-540-56939-1_82}, url = {https://doi.org/10.1007%2F3-540-56939-1_82}, year = {1993}, publisher = {Springer Berlin Heidelberg}, pages = {313--324}, author = {Oscar H. Ibarra and Tao Jiang and Nicholas Tran and Hui Wang}, title = {New decidability results concerning two-way counter machines and applications}, booktitle = {Automata, Languages and Programming} }