This templates adds an external link to an article in PlanetMath, a free community encyclopedia of mathematics.
Suppose you want to add an external link to PlanetMath's article on quotient rings. The title of this article is "Quotient ring" and the object id is 470 (given below the article). The code
* {{planetmath reference|id=470|title=Quotient ring}}
will produce the link
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