@incollection{HANF_2014,
    doi = {10.1016/b978-0-7204-2233-7.50020-4},
    url = {https://doi.org/10.1016%2Fb978-0-7204-2233-7.50020-4},
    year = {2014},
    publisher = {Elsevier},
    pages = {132--145},
    author = {WILLIAM HANF},
    title = {{MODEL}-{THEORETIC} {METHODS} {IN} {THE} {STUDY} {OF} {ELEMENTARY} {LOGIC}},
    booktitle = {The Theory of Models}
}

@incollection{HANF_2014, doi = {10.1016/b978-0-7204-2233-7.50020-4}, url = {https://doi.org/10.1016%2Fb978-0-7204-2233-7.50020-4}, year = {2014}, publisher = {Elsevier}, pages = {132--145}, author = {WILLIAM HANF}, title = {{MODEL}-{THEORETIC} {METHODS} {IN} {THE} {STUDY} {OF} {ELEMENTARY} {LOGIC}}, booktitle = {The Theory of Models} }