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Sample Output

It is generally recognized that frogs are greener than grass.[1]

A little known [3] fact, however, is that frogs can move backwards in time.[2, p4982]

References

1. http://all-about-frogs.com/green.html The most comprehensive source on green frogs on the web
2. The Encyclopedia Galactica, available on a planet near you
3. Poll on all-about-frogs.com