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First records of the gall midge Obolodiplosis robiniae (Haldeman)(Diptera: Cecidomyiidae) and its associated parasitoid Platygaster robiniae Buhl & Duso (Hymenoptera: Platygastridae) in Switzerland
Kinderkosten und Familiengründung: Erste Befunde einer Prüfung der Neuen Haushaltsökonomie unter Verwendung von Paardaten: Child-related costs and the transition to parenthood: A preliminary test of the New Home Economics using data from German couples.
Paul Johnson, Christoph Conrad and David Thomson, Workers versus pensioners: intergenerational justice in an ageing world.(Manchester: Manchester University Press, 1989.)£ 22.50 (cloth).