On Łukasiewicz's Ł-modal system

Timothy Smiley. On Łukasiewicz's Ł-modal system. Notre Dame Journal of Formal Logic, 2(3):149-153, 1961. [doi]

@article{Smiley61,
  title = {On Łukasiewicz's Ł-modal system},
  author = {Timothy Smiley},
  year = {1961},
  doi = {10.1305/ndjfl/1093956874},
  url = {http://dx.doi.org/10.1305/ndjfl/1093956874},
  researchr = {https://researchr.org/publication/Smiley61},
  cites = {0},
  citedby = {0},
  journal = {Notre Dame Journal of Formal Logic},
  volume = {2},
  number = {3},
  pages = {149-153},
}