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Economics Letters > 2016 > 148 > C > 48-52
China Economic Review > 2002 > 13 > 1 > 27-52
Applied Mathematics-A Journal of Chinese Universities > 1998 > 13 > 1 > 68-76
Economics Letters > 2016 > 148 > C > 48-52
China Economic Review > 2002 > 13 > 1 > 27-52
Applied Mathematics-A Journal of Chinese Universities > 1998 > 13 > 1 > 68-76