Written by: Erik Simanis and Stuart Hart
Published in 2008 by Cornell University 
http://www.bop-protocol.org/docs/BoPProtocol2ndEdition2008.pdf

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Editor's Note: I'm frankly not a big "bottom of the pyramid" guy, but this protocol, uniquely presented by Messrs Simanis and Hart, makes the whole idea make a lot more sense to me. Take a look and see what you think.

http://www.bop-protocol.org/docs/BoPProtocol2ndEdition2008.pdf