- http://en.wikipedia.org/wiki/Pixel_density
- https://en.wikipedia.org/wiki/Halftone
- http://sebastien-gabriel.com/designers-guide-to-dpi/
- http://wolfcrow.com/blog/notes-by-dr-optoglass-the-resolution-of-the-human-eye/
- http://clarkvision.com/imagedetail/eye-resolution.html
- http://webvision.med.utah.edu/book/part-viii-gabac-receptors/visual-acuity/
- http://blog.cibutin.com/cem-en/?p=40
- http://lea.verou.me/
- http://github.com/LeaVerou/dpi
- https://twitter.com/share
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