@incollection{Berghofer_2002,
    doi = {10.1007/3-540-45842-5_2},
    url = {https://doi.org/10.1007%2F3-540-45842-5_2},
    year = {2002},
    publisher = {Springer Berlin Heidelberg},
    pages = {24--40},
    author = {Stefan Berghofer and Tobias Nipkow},
    title = {Executing Higher Order Logic},
    booktitle = {Lecture Notes in Computer Science}
}

@incollection{Berghofer_2002, doi = {10.1007/3-540-45842-5_2}, url = {https://doi.org/10.1007%2F3-540-45842-5_2}, year = {2002}, publisher = {Springer Berlin Heidelberg}, pages = {24--40}, author = {Stefan Berghofer and Tobias Nipkow}, title = {Executing Higher Order Logic}, booktitle = {Lecture Notes in Computer Science} }