H
[HS91] Joseph Y. Halpern and Yoav Shoham. A Propositional Modal Logic of Time Intervals. Journal of the ACM 38(4):935-962. ACM Press, October 1991. 
@article{jacm38(4)-HS,
  author =              {Halpern, Joseph Y. and Shoham, Yoav},
  title =               {A Propositional Modal Logic of Time Intervals},
  publisher =           {ACM Press},
  journal =             {Journal of the~ACM},
  volume =              {38},
  number =              {4},
  pages =               {935-962},
  year =                {1991},
  month =               oct,
}
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