remove <sub> from url, see #179

phetsims · Nov 9, 2015 · 391a894 · 391a894
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diff --git a/doc/model.md b/doc/model.md
@@ -5,7 +5,7 @@ This document describes the model for the Gravity and Orbits simulation.
 
 ## Algorithm
 
-The model uses an algorithm based on exponential decompositions from this paper: http://arxiv.org/pdf/cond-mat/0110585v<sub>1</sub>.pdf, equation 22.
+The model uses an algorithm based on exponential decompositions from this paper: http://arxiv.org/pdf/cond-mat/0110585v1.pdf, equation 22.
 
 Here is the algorithm for stepping from time *t* to *t + h*: