Ok, here you go. This is helpful.

The Use of Cannabis as a Mood Stabilizer in Bipolar Disorder:
Anecdotal Evidence and the Need for Clinical Research

by Lester Grinspoon, M.D. & James B. Bakalar

Published in Journal of Psychoactive Drugs, Volume 30 (2), April - June 1998, pp. 171-177.

http://www.onlinepot.org/medical/article12.htm