@misc{BaltesSowarkaKliegl2009,
  author    = {Paul B. Baltes and Doris Sowarka and Reinhold Kliegl},
  title     = {Cognitive training research on fluid intelligence in old age : what can older adults achieve by themselves?},
  institution = {Department Psychologie},
  series    = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  number    = {paper 152},
  type      = {postprint},
  year        = {2009},
}