Independence of the axioms and rules of inference of one system of the extended propositional calculus. Georgieva, N. Notre Dame Journal of Formal Logic, 12(2):214-218, 1971.
Independence of the axioms and rules of inference of one system of the extended propositional calculus. [link]Link  Independence of the axioms and rules of inference of one system of the extended propositional calculus. [link]Paper  bibtex   
@article{journals/ndjfl/Georgieva71,
  author = {Georgieva, Nadejda},
  ee = {http://dx.doi.org/10.1305/ndjfl/1093894221},
  interhash = {4f10251a432f4392ea34ce2624097727},
  intrahash = {f4b75a9008eb4de3c1daceaed7157881},
  journal = {Notre Dame Journal of Formal Logic},
  number = 2,
  pages = {214-218},
  title = {Independence of the axioms and rules of inference of one system of the extended propositional calculus.},
  url = {http://dblp.uni-trier.de/db/journals/ndjfl/ndjfl12.html#Georgieva71},
  volume = 12,
  year = 1971
}

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