Merged in changes from the other main branch.

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+@inproceedings{989866,
+  author =      {Ken Hinckley and Gonzalo Ramos and Francois
+                  Guimbretiere and Patrick Baudisch and Marc Smith},
+  title =       {Stitching: pen gestures that span multiple displays},
+  booktitle =   {AVI '04: Proceedings of the working conference on
+                  Advanced visual interfaces},
+  year =        {2004},
+  isbn =        {1-58113-867-9},
+  pages =       {23--31},
+  location =    {Gallipoli, Italy},
+  doi =                 {http://doi.acm.org/10.1145/989863.989866},
+  publisher =   {ACM Press},
+  address =     {New York, NY, USA},
+}