@article{fortnowGrochowPEq2011,
    AUTHOR = {Fortnow, Lance and Grochow, Joshua A.},
     TITLE = {Complexity classes of equivalence problems revisited},
   JOURNAL = {Inform. and Comput.},
  FJOURNAL = {Information and Computation},
    VOLUME = {209},
      YEAR = {2011},
    NUMBER = {4},
     PAGES = {748--763},
      ISSN = {0890-5401},
      NOTE = {Also available as arXiv e-print cs/0907.4775},
}