@article{Amano_2004,
    doi = {10.1137/s009753970138445x},
    url = {https://doi.org/10.1137%2Fs009753970138445x},
    year = {2004},
    month = {jan},
    publisher = {Society for Industrial {\&} Applied Mathematics ({SIAM})},
    volume = {33},
    number = {2},
    pages = {433--447},
    author = {Kazuyuki Amano and Akira Maruoka},
    title = {The Potential of the Approximation Method},
    journal = {{SIAM} Journal on Computing}
}

@article{Amano_2004, doi = {10.1137/s009753970138445x}, url = {https://doi.org/10.1137%2Fs009753970138445x}, year = {2004}, month = {jan}, publisher = {Society for Industrial {\&} Applied Mathematics ({SIAM})}, volume = {33}, number = {2}, pages = {433--447}, author = {Kazuyuki Amano and Akira Maruoka}, title = {The Potential of the Approximation Method}, journal = {{SIAM} Journal on Computing} }