@article{DBLP:journals/siamcomp/CaiGHHSWW89,
  author    = {Jin-yi Cai and
               Thomas Gundermann and
               Juris Hartmanis and
               Lane A. Hemachandra and
               Vivian Sewelson and
               Klaus W. Wagner and
               Gerd Wechsung},
  title     = {The Boolean Hierarchy II: Applications},
  journal   = {SIAM J. Comput.},
  volume    = {18},
  number    = {1},
  year      = {1989},
  pages     = {95-111},
  ee        = {http://dx.doi.org/10.1137/0218007},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}