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added Category:美國人 using HotCat
*[https://baike.baidu.com/item/%E5%A5%A5%E5%B0%94%E6%A3%AE/1338241 百度百科-奥尔森 （美国经济学家和社会学家）]
*[https://www.goodreads.com/author/list/5538811.Mancur_Olson Goodreads -Books by Mancur Olson]
[[Category:美國人]]