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| web | Institute on Taxation and Econ... | 2019-02-01 | ||
| web | Institute on Taxation and Econ... | 2019-02-01 | ||
| web | MarketWatch | 2018-01-05 | ||
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| web | Matthew Cunningham-Cook | International Business Times | 2014-12-11 | |
| web | Chad Brooks | BusinessNewsDaily | 2012-07-20 |