I recently attributed my discovery of a research paper: Group Discussion as Interactive Dialogue or as Serial Monologue: The Influence of Group Size by Nicolas Fay; Simon Garrod; Jean Carletta to Keith de la Rue.
I was wrong. Stephen Mugford pointed me to it via this great SlideShare presentation of his:
Why size matters: groups, dialog and high quality participation. My apologies Stephen.
It also includes some interesting comments on How to Run a Good Conference from the late Aaron Swartz