@unpublished{BermanTarkhanov2008,
  author  = {Gennady Berman and Nikolai Nikolaevich Tarkhanov},
  title   = {Quantum dynamics in the Fermi-Pasta-Ulam problem},
  institution = {Institut f{\"u}r Mathematik},
  series    = {Preprint},
  number    = {(2004) 05},
  year    = {2008},
}