A
[Abr79] Karl Abrahamson. Modal Logic of Concurrent Nondeterministic Programs. In SCC'79, Lecture Notes in Computer Science 70, pages 21-33. Springer-Verlag, July 1979. 
@inproceedings{scc1979-Abr,
  author =              {Abrahamson, Karl},
  title =               {Modal Logic of Concurrent Nondeterministic Programs},
  editor =              {Kahn, Gilles},
  booktitle =           {{P}roceedings of the International Symposium
                         Semantics of Concurrent Computation ({SCC}'79)},
  acronym =             {{SCC}'79},
  publisher =           {Springer-Verlag},
  series =              {Lecture Notes in Computer Science},
  volume =              {70},
  pages =               {21-33},
  year =                {1979},
  month =               jul,
}
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