L
[LPW+99] Kim Guldstrand Larsen, Justin Pearson, Carsten Weise, and Wang Yi. Clock Difference Diagrams. Nordic Journal of Computing 6(3):271-298. Publishing Association Nordic Journal of Computing, 1999. 
@article{njc6(3)-LPWY,
  author =              {Larsen, Kim Guldstrand and Pearson, Justin and
                         Weise, Carsten and Yi, Wang},
  title =               {Clock Difference Diagrams},
  publisher =           {Publishing Association Nordic Journal of Computing},
  journal =             {Nordic Journal of Computing},
  volume =              {6},
  number =              {3},
  pages =               {271-298},
  year =                {1999},
}
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