@incollection{Gonthier,
    doi = {10.1007/978-3-540-87827-8_28},
    url = {https://doi.org/10.1007%2F978-3-540-87827-8_28},
    publisher = {Springer Berlin Heidelberg},
    pages = {333--333},
    author = {Georges Gonthier},
    title = {The Four Colour Theorem: Engineering of a Formal Proof},
    booktitle = {Computer Mathematics}
}

@incollection{Gonthier, doi = {10.1007/978-3-540-87827-8_28}, url = {https://doi.org/10.1007%2F978-3-540-87827-8_28}, publisher = {Springer Berlin Heidelberg}, pages = {333--333}, author = {Georges Gonthier}, title = {The Four Colour Theorem: Engineering of a Formal Proof}, booktitle = {Computer Mathematics} }