@article{808297,
      author = {Fitting, Melvin,},
      url = {http://library.usi.edu/record/808297},
      title = {Raymond Smullyan on self reference /},
      doi = {https://doi.org/10.1007/978-3-319-68732-2},
      recid = {808297},
      pages = {1 online resource.},
}