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* [https://www.youtube.com/watch?v=boLqmFIzUZ0 Dan Pixley's video on "Airlocks 101 for Sour Beers".]
* [http://www.faybutler.com/pdf_files/HowHoseMaterialsAffectGas3.pdf The oxygen permeability of different plastics.]
* [http://beachwoodbbq.com/pdf/BBAIBLTBLENDERY.pdf "Brewing Beer in America Inspired By the Belgian Lambic Tradition" by Ryan Fields, head brewer and blender at Beachwood Blendery.]
==Modern Method - Fast Fermentation==