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Yang, JS., Kwak, W., Kaizoji, T. et al. Increasing market efficiency in the stock markets. Eur. Phys. J. B 61, 389 (2008). https://doi.org/10.1140/epjb/e2008-00088-x
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DOI: https://doi.org/10.1140/epjb/e2008-00088-x