* [http://www.as220.org/labs/drawbot/ AS220]
* [http://www.polargraph.co.uk/whats-a-polargraph/ Polargraph]
* [http://thisiscolossal.com/2011/09/custom-polargraph-drawings/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+colossal+%28Colossal%29 Colossal - Custom Polargraph Drawings]
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