@article{Tanaka03,
  title = {Some Proof Systems for Common Knowledge Predicate},
  author = {Yoshihito Tanaka},
  year = {2003},
  url = {http://www.iphils.uj.edu.pl/rml/rml-37/a-tan-37.htm},
  researchr = {https://researchr.org/publication/Tanaka03},
  cites = {0},
  citedby = {0},
  journal = {Reports on Mathematical Logic},
  volume = {37},
  pages = {79-100},
}