Optimal Semicomputable Approximations to Reachable and Invariant Sets. Collins, P. Theory of Computing Systems, 41(1):33–48, 2007.
Optimal Semicomputable Approximations to Reachable and Invariant Sets [link]Paper  bibtex   
@ARTICLE{Col07a,
  author = {Collins, Pieter},
  title = {Optimal Semicomputable Approximations to Reachable and Invariant
	Sets},
  journal = {Theory of Computing Systems},
  year = {2007},
  volume = {41},
  pages = {33--48},
  number = {1},
  keywords = {bib,cca},
  url = {http://dx.doi.org/10.1007/s00224-006-1338-3}
}

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