Double-blind, placebo-controlled comparison of imipramine and paroxetine in the treatment of bipolar depression. - Nemeroff,C.B.; Evans,D.L.; Gyulai,L.; Sachs,G.S.; Bowden,C.L.; Gergel,I.P.; Oakes,R.; Pitts,C.D. (Am J Psychiatry, 2001)