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-Check also the very interesting <a href="http://research.microsoft.com/en-us/um/people/kopf/pixelart/">Depixelizing Pixel Art</a>
-and its <a href="http://research.microsoft.com/en-us/um/people/kopf/pixelart/supplementary/multi_comparison.html">Multi Comparison</a>.
+Check also the very interesting <a href="https://johanneskopf.de/publications/pixelart/paper/pixel.pdf">Depixelizing Pixel Art</a>.
 With modern processors you can do a lot better than Scale2x.
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