Efficacy of olanzapine in combination with valproate or lithium in the treatment of mania in patients partially nonresponsive to valproate or lithium monotherapy - Tohen,M.; Chengappa,K.NR.; Suppes,T.; Zarate,D.; Calabrese,J.R.; Bowden,C.L.; Sachs,G.S.; Kupfer,D.J.; Baker,R.W.; Risser,R.C.; Keeten,E.L.; Feldman,P.D.; et al. (Arch Gen Psychiat, 2002)