A
[ACH97] Rajeev Alur, Costas Courcoubetis, and Thomas A. Henzinger. Computing Accumulated Delays in Real Time Systems. Formal Methods in System Design 11(2):137-155. Kluwer Academic, August 1997. 
@article{fmsd11(2)-ACH,
  author =              {Alur, Rajeev and Courcoubetis, Costas and Henzinger,
                         Thomas A.},
  title =               {Computing Accumulated Delays in Real Time Systems},
  publisher =           {Kluwer Academic},
  journal =             {Formal Methods in System Design},
  volume =              {11},
  number =              {2},
  pages =               {137-155},
  year =                {1997},
  month =               aug,
}
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