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              Verbeek M (2004) A guide to modern econometrics. John Wiley & Sons Ltd., West Sussex Weber I (2005) Mehr Patienten, weniger Ärzte und geringere Finanzmittel. Deutsches Ärzteblatt 12:540-541
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              Verbeek M. (2004) A Guide to Modern Econometrics, Wiley & Sons, Chichester.
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              Verbeek, M. (2004) A Guide to Modern Econometrics. John Wiley and Sons, Chichester.
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              Verbeek, M. (2004), A Guide to Modern Econometrics, second edn, Wiley.
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              Verbeek, M. (2004). A guide to modern econometrics (2d ed.). Chichester: Wiley & Sons.
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              Verbeek, M. (2004): A Guide to Modern Econometrics, second edition, Wiley.
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              Verbeek, M. (2004): A Guide to Modern Econometrics. 2 nd edition. Wiley. ZEW (2005) http://www.zew.de/de/publikationen/Konjunkturerwartungen/konjunk- turerwartungenberechnung.php3
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              Verbeek, M. (2004): A Guide to Modern Econometrics. 2. Auflage. Chichester et al.
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              Verbeek, M., 2004. A Guide to Modern Econometrics, 2nd ed. John Wiley & Sons, Chichester . World Bank. (n.d.). World Development Indicators . World Bank. (2019). Doing Business . https://www.doingbusiness.org/en/data World Economic Forum. (2021). Executive Opinion Survey .
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              Verbeek, Marno (2004): "A Guide to Modern Econometrics". Baffins Lane, Chichester: John Wiley and Sons.
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              Verbeek, Marno (2004): A Guide to Modern Econometrics. Chichester: John Wiley & Sons.
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              Verbeek, M., Wiley, J., Sons, C. W. B. (2004). A Guide to Modern Econometrics". Baffins Lane, Chichester: John Wiley & Sons Ltd., West Sussex Weber I. Deutsches Ärzteblatt, 12 pp. 540-541.
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