Update README.md

PtrMan · Dec 8, 2015 · 9cf4e77 · 9cf4e77
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@@ -10,3 +10,5 @@ Papers Links etc
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 http://www.scicontrols.com/index.htm  (for most papers see here)
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+http://www.scirp.org/Journal/PaperInformation.aspx?PaperID=43568 Causal Groupoid Symmetries