Basic Modal Logic

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@incollection{modallogic-handbookphilologic1984,
   address = {Dordrecht},
   author = {Bull, Robert and Segerberg, Krister},
   booktitle = {Handbook of Philosophical Logic},
   doi = {10.1007/978-94-009-6259-0_1},
   editor = {Gabbay, Dov and Guenthner, F.},
   isbn = {978-94-009-6259-0},
   pages = {1--88},
   publisher = {Springer Netherlands},
   title = {Basic Modal Logic},
   url = {http://link.springer.com/10.1007/978-94-009-6259-0_1},
   volume = {II: Extensions of Classical Logic},
   year = 1984
}