G
[Got95] Georg Gottlob. NP Trees and Carnap's Modal Logic. Journal of the ACM 42(2):421-457. ACM Press, March 1995. 
@article{jacm42(2)-Got,
  author =              {Gottlob, Georg},
  title =               {{NP} Trees and {C}arnap's Modal Logic},
  publisher =           {ACM Press},
  journal =             {Journal of the~ACM},
  volume =              {42},
  number =              {2},
  pages =               {421-457},
  year =                {1995},
  month =               mar,
}
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