Updated docs/references.txt

dbarker · Mar 15, 2013 · 6667b63 · 6667b63
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@@ -7,4 +7,6 @@ References
 ----------
 [1] Th. Dracos (editor). Three-Dimensional Velocity and Vorticity Measuring
     and Image Analysis Techniques. Kluwer Academic Publishers. 1996.
+
+[2] J. Willneff, Ph.D. Thesis, ETH Zurich, A Spatio-Temporal Matching Algorithm for 3D Particle Tracking Velocimetry, http://webfarm102b.ethz.ch/berichte/Blaue_Berichte_PDF/82.pdf