Here is some background reading about sour beer:

Beginner's Guide

Sour Microbes Explained:

The Madfermentationist blog is one of the highly regarded sources of info about sour beer brewing. This article from 2009 gives a great overview to the topic:

Ten of the Best Sour Beers in the UK

Once, All Beer was Made This Way:

Sour Beer Blog:

Milk the Funk - Wiki Page:

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Cheers Clibit. Low ABV Sour beers are on my list. 
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