@incollection{WeinertSchneiderBeckmann1991,
  author    = {Weinert, Franz E. and Schneider, Wolfgang and Beckmann, J.},
  title     = {F{\"a}higkeitsunterschiede, Fertigkeitstraining und Leistungsniveau},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-86612},
  publisher      = {Universit{\"a}t W{\"u}rzburg},
  year      = {1991},
  abstract  = {No abstract available.},
  subject      = {Leistung},
  language  = {de}
}
@incollection{Schneider1991,
  author    = {Schneider, Wolfgang},
  title     = {Methodische Probleme und M{\"o}glichkeiten schulbezogener L{\"a}ngsschnittforschung},
  url       = {http://nbn-resolving.de/urn:nbn:de:bvb:20-opus-86592},
  publisher      = {Universit{\"a}t W{\"u}rzburg},
  year      = {1991},
  abstract  = {No abstract available.},
  subject      = {L{\"a}ngsschnittuntersuchung},
  language  = {de}
}