@incollection{Rustan_1998,
    doi = {10.1007/bfb0026441},
    url = {https://doi.org/10.1007%2Fbfb0026441},
    year = {1998},
    publisher = {Springer Berlin Heidelberg},
    pages = {302--305},
    author = {K. Rustan and M. Leino and Greg Nelson},
    title = {An extended static checker for modula-3},
    booktitle = {Lecture Notes in Computer Science}
}

@incollection{Rustan_1998, doi = {10.1007/bfb0026441}, url = {https://doi.org/10.1007%2Fbfb0026441}, year = {1998}, publisher = {Springer Berlin Heidelberg}, pages = {302--305}, author = {K. Rustan and M. Leino and Greg Nelson}, title = {An extended static checker for modula-3}, booktitle = {Lecture Notes in Computer Science} }