@incollection{Harrison_2009,
    doi = {10.1007/978-3-642-03359-9_4},
    url = {https://doi.org/10.1007%2F978-3-642-03359-9_4},
    year = {2009},
    publisher = {Springer Berlin Heidelberg},
    pages = {60--66},
    author = {John Harrison},
    title = {{HOL} Light: An Overview},
    booktitle = {Lecture Notes in Computer Science}
}

@incollection{Harrison_2009, doi = {10.1007/978-3-642-03359-9_4}, url = {https://doi.org/10.1007%2F978-3-642-03359-9_4}, year = {2009}, publisher = {Springer Berlin Heidelberg}, pages = {60--66}, author = {John Harrison}, title = {{HOL} Light: An Overview}, booktitle = {Lecture Notes in Computer Science} }