@incollection{Shelah_1986,
    doi = {10.1007/bfb0098511},
    url = {https://doi.org/10.1007%2Fbfb0098511},
    year = {1986},
    publisher = {Springer Berlin Heidelberg},
    pages = {203--223},
    author = {Saharon Shelah},
    title = {Monadic logic: Hanf Numbers},
    booktitle = {Lecture Notes in Mathematics}
}

@incollection{Shelah_1986, doi = {10.1007/bfb0098511}, url = {https://doi.org/10.1007%2Fbfb0098511}, year = {1986}, publisher = {Springer Berlin Heidelberg}, pages = {203--223}, author = {Saharon Shelah}, title = {Monadic logic: Hanf Numbers}, booktitle = {Lecture Notes in Mathematics} }