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added external link to Lithuanian yeast DNA analysis
* ''Beer and Brewing Traditions in Norway'' by Odd Nordland, Universitetsforlaget, 1969.
* [http://poppylandbrewer.blogspot.no/2016/01/making-yeast-ring.html "Making a yeast ring", Poppyland Brewer blog.]
* [http://tikrasalus.lt/2012/05/01/lithuanian-countryside-yeast-tales/ "Lithuanian Countryside Yeast Tales," by ramtyns, 2012.]
==References==