@article{Abel_2008,
    doi = {10.1016/j.entcs.2007.11.009},
    url = {https://doi.org/10.1016%2Fj.entcs.2007.11.009},
    year = {2008},
    month = {feb},
    publisher = {Elsevier {BV}},
    volume = {199},
    pages = {3--16},
    author = {Andreas Abel},
    title = {Normalization for the Simply-Typed Lambda-Calculus in Twelf},
    journal = {Electronic Notes in Theoretical Computer Science}
}

@article{Abel_2008, doi = {10.1016/j.entcs.2007.11.009}, url = {https://doi.org/10.1016%2Fj.entcs.2007.11.009}, year = {2008}, month = {feb}, publisher = {Elsevier {BV}}, volume = {199}, pages = {3--16}, author = {Andreas Abel}, title = {Normalization for the Simply-Typed Lambda-Calculus in Twelf}, journal = {Electronic Notes in Theoretical Computer Science} }