Bradfield98'

BibTeX

@article{DBLP:journals/tcs/Bradfield98,
  author    = {Julian C. Bradfield},
  title     = {The Modal $\mu$-Calculus Alternation Hierarchy is Strict},
  journal   = {Theor. Comput. Sci.},
  volume    = {195},
  number    = {2},
  year      = {1998},
  pages     = {133-153},
  ee        = {http://dx.doi.org/10.1016/S0304-3975(97)00217-X},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}