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From en.swpat.org

References are a way to refer the reader to some proof for a claim.

[edit] Requesting references

If you find a statement which you feel needs to be justified, then add a {{reference needed}} tag, or the shortcut {{ref}} like so:

This is my statement which some might doubt.{{ref}}

This will be displayed as:

This is my statement which some might doubt.^{[reference needed]}

[edit] Adding references

When editing a page, you can add a reference by putting it inside a set of "<ref></ref>" tags, like so:

This is my statement which some might doubt.<ref>This is where a reader can find proof</ref>

Usually, the best thing to put in the "<ref></ref>" tags is a link to an external page.

The text in the ref tags should be displayed at the end of the article. For this to happen, there must be a {{reflist}} tag where you want them to be displayed - usually right after a "References" section title, like so:

==References==

{{reflist}}