@incollection{Mitchell_1993,
    doi = {10.1007/3-540-56992-8_21},
    url = {https://doi.org/10.1007%2F3-540-56992-8_21},
    year = {1993},
    publisher = {Springer Berlin Heidelberg},
    pages = {352--378},
    author = {John C. Mitchell and Andre Scedrov},
    title = {Notes on sconing and relators},
    booktitle = {Computer Science Logic}
}

@incollection{Mitchell_1993, doi = {10.1007/3-540-56992-8_21}, url = {https://doi.org/10.1007%2F3-540-56992-8_21}, year = {1993}, publisher = {Springer Berlin Heidelberg}, pages = {352--378}, author = {John C. Mitchell and Andre Scedrov}, title = {Notes on sconing and relators}, booktitle = {Computer Science Logic} }