@incollection{Ko_2018,
    doi = {10.1007/978-3-319-98654-8_38},
    url = {https://doi.org/10.1007%2F978-3-319-98654-8_38},
    year = {2018},
    publisher = {Springer International Publishing},
    pages = {465--477},
    author = {Sang-Ki Ko and Reino Niskanen and Igor Potapov},
    title = {Reachability Problems in Nondeterministic Polynomial Maps on the Integers},
    booktitle = {Developments in Language Theory}
}

@incollection{Ko_2018, doi = {10.1007/978-3-319-98654-8_38}, url = {https://doi.org/10.1007%2F978-3-319-98654-8_38}, year = {2018}, publisher = {Springer International Publishing}, pages = {465--477}, author = {Sang-Ki Ko and Reino Niskanen and Igor Potapov}, title = {Reachability Problems in Nondeterministic Polynomial Maps on the Integers}, booktitle = {Developments in Language Theory} }