@incollection{Abel,
    doi = {10.1007/978-3-540-70594-9_4},
    url = {https://doi.org/10.1007%2F978-3-540-70594-9_4},
    publisher = {Springer Berlin Heidelberg},
    pages = {29--56},
    author = {Andreas Abel and Thierry Coquand and Peter Dybjer},
    title = {Verifying a Semantic {$\beta$}{$\eta$}-Conversion Test for Martin-L\"f Type Theory},
    booktitle = {Lecture Notes in Computer Science}
}

@incollection{Abel, doi = {10.1007/978-3-540-70594-9_4}, url = {https://doi.org/10.1007%2F978-3-540-70594-9_4}, publisher = {Springer Berlin Heidelberg}, pages = {29--56}, author = {Andreas Abel and Thierry Coquand and Peter Dybjer}, title = {Verifying a Semantic {$\beta$}{$\eta$}-Conversion Test for Martin-L\"f Type Theory}, booktitle = {Lecture Notes in Computer Science} }