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Bachmann, Reinhard, Baumgarten, Walter, Weißbach, Hans-Jürgen, Lampe, Carsten and Zimmermann, Eberhard (1991) 'Implementation und Evaluation eines PPS-Systems in einem Bekleidungsbetrieb. Information and Kommunikation 4/91.' Dortmund: IUK Institut.
Driver, Ciaran and Moreton, David (1991) 'The Influence of Uncertainty on UK Manufacturing Investment.' The Economic Journal, 101 (409). pp. 1452-1459.