@incollection{Pfenning_1990,
    doi = {10.1007/bfb0040259},
    url = {https://doi.org/10.1007%2Fbfb0040259},
    year = {1990},
    publisher = {Springer-Verlag},
    pages = {209--228},
    author = {Frank Pfenning and Christine Paulin-Mohring},
    title = {Inductively defined types in the Calculus of Constructions},
    booktitle = {Lecture Notes in Computer Science}
}

@incollection{Pfenning_1990, doi = {10.1007/bfb0040259}, url = {https://doi.org/10.1007%2Fbfb0040259}, year = {1990}, publisher = {Springer-Verlag}, pages = {209--228}, author = {Frank Pfenning and Christine Paulin-Mohring}, title = {Inductively defined types in the Calculus of Constructions}, booktitle = {Lecture Notes in Computer Science} }