@misc{OrphanidesWilliams2005,
  author    = {Athanasios Orphanides and John C. Williams},
  title     = {Imperfect knowledge, inflation expectations, and monetary policy},
  institution = {Center for Financial Studies (CFS)},
  series    = {CFS working paper series},
  number    = {2003, 40},
  year      = {2005}
}