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added external link to "How yeast use oxygen"
* [https://www.vlb-berlin.org/en/services/pure-yeast-cultures VLB Berlin pure yeast cultures.]
* [http://www.mrmalty.com/yeast.htm Yeast Strain Comparison Chart (White Labs, Wyeast) - information by Kristen England on Mr. Malty website.]
* [https://www.morebeer.com/articles/how_yeast_use_oxygen In depth article by Tracy Aquilla on yeast respiration, "How Yeast Use Oxygen".]
==References==