Abacus
- Fernandes, Luis. The Abacus: The Art of Calculating with Beads.
- Schreiber, Michael (2007). Abacus. The Wolfram Demonstrations Project.
- Stephenson, Steve. The Stephenson Abacus.
- Abacus in Various Number Systems at cut-the-knot
- Java applet of Chinese, Japanese and Russian abaci
- An atomic-scale abacus
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