Janssen, M. C. W. (1990). Bertrand competition and Keynesian economics. Institute of Economic Research, Faculty of Economics, University of Groningen.
Chicago-referens (17:e uppl.)Janssen, Maarten C. W. Bertrand Competition and Keynesian Economics. Groningen [Netherlands]: Institute of Economic Research, Faculty of Economics, University of Groningen, 1990.
MLA-referens (8:e uppl.)Janssen, Maarten C. W. Bertrand Competition and Keynesian Economics. Institute of Economic Research, Faculty of Economics, University of Groningen, 1990.
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