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3. Bernake’s bubble laboratory: Princeton protégés of Fed chief study the economics of manias;Lahart;The Wall Street Journal,2008
4. Why does the stock market fluctuate?;Barskey;Quarterly Journal of Economics,1993
5. G. Wu, Are there speculative bubbles in stock markets? Evidence from an alternative approach, http://www.nes.ru/agoriaev/Papers/Wu%20Bubbles%20US%20Honkong.pdf, 2002