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1
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2de réir Habich, Roland, Noll, Heinz-Herbert, Zapf, Wolfgang
Foilsithe in ISI: Informationsdienst Soziale Indikatoren (1999)Gairmuimhir: 2420/1Alt -
3Foilsithe / Cruthaithe 1995Rannpháirtithe: “…Habich, Roland…”
Gairmuimhir: 2501/13LEABHAR