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"It’s Panda Update 2.1, Not Panda 3.0, Google Says". Search Engine Land. Retrieved February 2, 2014.  Schwartz, Barry (May 9, 2011). "Google Panda 3.0"

google-penguin-google-panda-and-google-algorithms-2013Google Penguin, Google Panda, and Google Algorithms 2013
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Bill Hartzer provides a historical view of the Google algorithms most in use today, including Google Panda, Google Penguin, and Google Hummingbird. Learn about these algorithm and filters, and how to recover from Google Penguin and Google Panda if your website was penalized.

Google Panda Continuous Update But Gets Prepared Between Roll Outs?
Search Engine Roundtable, on Wed, 24 Feb 2016 05:12:45 -0800
The interesting part is not the continuously rolling out part, that we know now. But that Google gets the " next update gets prepared" and then it rolls out also. What is Google preparing here? It is confusing, again. I guess Panda is a continuous roll