To make the last two columns of your paper balanced in the proceedings two column version (this is usually the bibiliography), include the command:


and before the bibliography include the command:

  1. I think you can also \usepackage{flushed} (with no command before the bib).

    Also, your web site deletes the comment if you make an error on the reCAPTCHA, forcing it to be retyped. 🙂