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Ok. Some of us are less familar with the jargon of the doc files: I had read that the option was columns=3 but I didn't know where I was supposed to write that. Now it makes sense. Sorry for annoying you. Thanks for your assistance anyway.

Thanks a lot. It works. BTW, do you know how I can set the options of having three columns?

I'm using the article class. I use \printindex to print an index before the references, but I would like the references to start right after the index, and not in a new page.

Thanks in advance for your help.