twilight … partial darkness; (fig.) gradual decay or destruction of something once glorious … t. state hysterical state of unawareness of external realities i — Annual Report , Bank for International Settlements, Basle, June 1981, p. 25 — World Economic Outlook , International Monetary Fund, Washington, June 1981, pp. 8–9 — OECD Observer , Organisation for Economic Cooperation and Development, Paris, July 1981, p. 13
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Richard Blackhurst (1981) studied this question.