<a href="http:&#x2F;&#x2F;eml.berkeley.edu&#x2F;&#x2F;~saez&#x2F;saez-UStopincomes-2012.pdf" rel="nofollow">http:&#x2F;&#x2F;eml.berkeley.edu&#x2F;&#x2F;~saez&#x2F;saez-UStopincomes-2012.pdf</a><p>That is the first i found. But it is somewhat dated.