http://www.cropcircleanswers.com/CC_Vacuum_Domain.htm
Originally published in UFO Magazine/UK in 2003 as:
Non-Manmade Crop Circles
As a “Vacuum Domain" Phenomenon
An Aspect of the Physics Involved?
Updated August 7, 2008 as:
Of Crop Circles, Firebirds, and 'Vacuum Domain' Physics
By Kris Sherwood
With additional research contributed by Ed Sherwood
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This is interesting