@incollection{Tozawa,
    doi = {10.1007/978-3-540-71389-0_25},
    url = {https://doi.org/10.1007%2F978-3-540-71389-0_25},
    publisher = {Springer Berlin Heidelberg},
    pages = {346--360},
    author = {Akihiko Tozawa and Yasuhiko Minamide},
    title = {Complexity Results on Balanced Context-Free Languages},
    booktitle = {Foundations of Software Science and Computational Structures}
}

@incollection{Tozawa, doi = {10.1007/978-3-540-71389-0_25}, url = {https://doi.org/10.1007%2F978-3-540-71389-0_25}, publisher = {Springer Berlin Heidelberg}, pages = {346--360}, author = {Akihiko Tozawa and Yasuhiko Minamide}, title = {Complexity Results on Balanced Context-Free Languages}, booktitle = {Foundations of Software Science and Computational Structures} }