@article{Barto_2009,
    doi = {10.1137/070708093},
    url = {https://doi.org/10.1137%2F070708093},
    year = {2009},
    month = {jan},
    publisher = {Society for Industrial {\&} Applied Mathematics ({SIAM})},
    volume = {38},
    number = {5},
    pages = {1782--1802},
    author = {Libor Barto and Marcin Kozik and Todd Niven},
    title = {The {CSP} Dichotomy Holds for Digraphs with No Sources and No Sinks (A Positive Answer to a Conjecture of Bang-Jensen and Hell)},
    journal = {{SIAM} Journal on Computing}
}

@article{Barto_2009, doi = {10.1137/070708093}, url = {https://doi.org/10.1137%2F070708093}, year = {2009}, month = {jan}, publisher = {Society for Industrial {\&} Applied Mathematics ({SIAM})}, volume = {38}, number = {5}, pages = {1782--1802}, author = {Libor Barto and Marcin Kozik and Todd Niven}, title = {The {CSP} Dichotomy Holds for Digraphs with No Sources and No Sinks (A Positive Answer to a Conjecture of Bang-Jensen and Hell)}, journal = {{SIAM} Journal on Computing} }