G
[Gor96] Valentin Goranko. Hierarchies of Modal and Temporal Logics with Reference Pointers. Journal of Logic, Language and Information 5(1):1-24. Kluwer Academic, April 1996. 
@article{jolli5(1)-Gor,
  author =              {Goranko, Valentin},
  title =               {Hierarchies of Modal and Temporal Logics with
                         Reference Pointers},
  publisher =           {Kluwer Academic},
  journal =             {Journal of Logic, Language and Information},
  volume =              {5},
  number =              {1},
  pages =               {1-24},
  year =                {1996},
  month =               apr,
}
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