Per Year

@article{godel1931,
    apice = {Godel1931},
    author = {Kurt Gödel},
    doi = {10.1007/BF01700692},
    eissn = {1436-5081},
    issn = {0026-9255},
    journal = {Monatshefte für Mathematik und Physik},
    number = 1,
    pages = {173--198},
    title = {Über formal unentscheidbare Sätze der Principia Mathematica und verwandter Systeme I},
    url = {https://link.springer.com/10.1007/BF01700692},
    volume = 38,
    year = 1931
}