Abstract
The author gives defines the title of the article and describes the different methods used in this way of looking into the future there is a list of 20 references.
The author gives defines the title of the article and describes the different methods used in this way of looking into the future there is a list of 20 references.
Planning Methodiek en Toepassing, 1978, No.7, p. 2-11, graph, tab., ref.
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