@incollection{Hemer_2001,
    doi = {10.1007/3-540-44755-5_18},
    url = {https://doi.org/10.1007%2F3-540-44755-5_18},
    year = {2001},
    publisher = {Springer Berlin Heidelberg},
    pages = {249--260},
    author = {David Hemer and Ian Hayes and Paul Strooper},
    title = {Refinement Calculus for Logic Programming in Isabelle/{HOL}},
    booktitle = {Lecture Notes in Computer Science}
}

@incollection{Hemer_2001, doi = {10.1007/3-540-44755-5_18}, url = {https://doi.org/10.1007%2F3-540-44755-5_18}, year = {2001}, publisher = {Springer Berlin Heidelberg}, pages = {249--260}, author = {David Hemer and Ian Hayes and Paul Strooper}, title = {Refinement Calculus for Logic Programming in Isabelle/{HOL}}, booktitle = {Lecture Notes in Computer Science} }