@article{K_bler_1992,
    doi = {10.1007/bf01200427},
    url = {https://doi.org/10.1007%2Fbf01200427},
    year = {1992},
    month = {dec},
    publisher = {Springer Science and Business Media {LLC}},
    volume = {2},
    number = {4},
    pages = {301--330},
    author = {Johannes Köbler and Uwe Schöning and Jacobo Torán},
    title = {Graph isomorphism is low for {PP}},
    journal = {Computational Complexity}
}

@article{K_bler_1992, doi = {10.1007/bf01200427}, url = {https://doi.org/10.1007%2Fbf01200427}, year = {1992}, month = {dec}, publisher = {Springer Science and Business Media {LLC}}, volume = {2}, number = {4}, pages = {301--330}, author = {Johannes Köbler and Uwe Schöning and Jacobo Torán}, title = {Graph isomorphism is low for {PP}}, journal = {Computational Complexity} }