@incollection{Richard_B_chi_1966,
    doi = {10.1016/s0049-237x(09)70564-6},
    url = {https://doi.org/10.1016%2Fs0049-237x%2809%2970564-6},
    year = {1966},
    publisher = {Elsevier},
    pages = {1--11},
    author = {J. Richard Büchi},
    title = {Symposium on Decision Problems: On a Decision Method in Restricted Second Order Arithmetic},
    booktitle = {Logic, Methodology and Philosophy of Science, Proceeding of the 1960 International Congress}
}

@incollection{Richard_B_chi_1966, doi = {10.1016/s0049-237x(09)70564-6}, url = {https://doi.org/10.1016%2Fs0049-237x%2809%2970564-6}, year = {1966}, publisher = {Elsevier}, pages = {1--11}, author = {J. Richard Büchi}, title = {Symposium on Decision Problems: On a Decision Method in Restricted Second Order Arithmetic}, booktitle = {Logic, Methodology and Philosophy of Science, Proceeding of the 1960 International Congress} }