The impact of an aggressive juror in six- and twelve-member juries.

Snortum, J. R., Klein, J. S., & Sherman, W. A. (1976). The impact of an aggressive juror in six- and twelve-member juries. Criminal Justice and Behavior, 3, 255-262.

General leniency shift after deliberation in juries without a confederate arguing strongly for conviction; severity shift for juries with confederate.

http://cjb.sagepub.com/content/3/3/255.full.pdf