Update original paper link (#1375)

holoviz · Dec 5, 2024 · 7a99f49 · 7a99f49
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diff --git a/examples/index.ipynb b/examples/index.ipynb
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     "see how it is used in many of the projects at [examples.pyviz.org](https://examples.pyviz.org).\n",
     "\n",
     "Some of the original ideas for Datashader were developed under the\n",
-    "name Abstract Rendering, which is described in a [2014 SPIE VDA paper](http://spie.org/Publications/Proceedings/Paper/10.1117/12.2041200).\n",
+    "name Abstract Rendering, which is described in a [2014 SPIE VDA paper](https://dx.doi.org/10.1117/12.2041200).\n",
     "\n",
     "The source code for datashader is maintained on [Github](https://github.com/holoviz/datashader), and\n",
     "is documented using the API link on this page.\n",