R
[Rac78] Charles Rackoff. The Covering and Boundedness Problems for Vector Addition Systems. Theoretical Computer Science 6:223-231. Elsevier, 1978. 
@article{tcs6()-Rac,
  author =              {Rackoff, Charles},
  title =               {The Covering and Boundedness Problems for Vector
                         Addition Systems},
  publisher =           {Elsevier},
  journal =             {Theoretical Computer Science},
  volume =              {6},
  pages =               {223-231},
  year =                {1978},
  doi =                 {10.1016/0304-3975(78)90036-1},
}
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