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On the main site, the (nearly invisible) cite button found in the share menu gives an example citation and gives both bibtex and amsref misc entries that are easy to cut and paste.

Unfortunately, the mechanism to generate the bibtex entry has some bugs.

@MISC {22350,
TITLE = {What are some examples of colorful language in serious mathematics  papers?},
AUTHOR = {François G. Dorais (http://mathoverflow.net/users/2000/francois-g-dorais)},
HOWPUBLISHED = {MathOverflow},
NOTE = {URL:http://mathoverflow.net/q/22350 (version: 2010-04-23)},
EPRINT = {http://mathoverflow.net/q/22350},
URL = {http://mathoverflow.net/q/22350}
}

To get a proper entry from this:

• First decode any HTML encoded characters. For example, &#231 above should be replaced by ç, {\c c}, or equivalent. If you use special characters like ç, make sure to use the LaTeX package inputenc with the appropriate encoding option (e.g. utf8). Also use bibtex8 since the original bibtex only supports the 7-bit ASCII character set.

• Since bibtex tries to parse the author field and break it into parts (first, last, suffix, etc.), it is best to remove the parenthetical link to the user profile since that will often break the parsing mechanism. (An alternative is to only use the link to the user profile and delete the name, but that might lead to sorting issues.)

• Since this post is an answer rather than a question, consider editing the title to make this clearer. You may also consider changing the URL to http://mathoverflow.net/a/22350.

• Bibtex traditionally only supports YEAR and MONTH of publication, which is unfortunately too coarse for MO posts. Fortunately, many styles do recognize the DATE field; consider adding it. If the post has a nontrivial revision history, you may want to put a date other than the first posting.

• If the bibtex style you use does recognize the EPRINT or URL fields, the visibly redundant entries containing the post URL could result in it being printed two or three times. Consequently, you may have to remove some of these entries to fit your preferred bibtex style.

• If you use the hyperref package, you could also wrap the URL in a \url command in the NOTE field so that it becomes clickable. Do not do this for the url field since styles that use this field will normally do the wrapping for you. A few styles support the URLDATE field which, combined with URL, is perhaps a better alternative than the given NOTE field.

• The use of the EPRINT field is extremely style dependent. Some styles will do something reasonable with the field given above but many more will not. Maybe there is some style out there that understands EPRINT but not URL. Unless you use that style, it's probably better to remove the EPRINT field.

I guess the best advice is to get to know the bibtex style you use and figure out the best way to format a MO bibtex entry for that style. Unfortunately, publishers will often force authors to use peculiar styles. If that's the case, ask the editor to explain how to properly format a MO bibtex entry for that style.