1. Cohen BM, Baldessarini RJ (1985) Tolerance to therapeutic effects of antidepressants. Am J Psychiatry 142: 489–490
2. Coppens HJ, Slooff CJ, Paans AMJ, Wiegman T, Vaalburg W, Korf J (1991) High central D2-dopamine receptor occupancy as assessed with positron emission tomography in medicated but therapy-resistant schizophrenic patients. Biol Psychiatry 29: 629–634
3. Garvey M, DeRubeis RJ, Hollon SD, Evans MD, Tuason VB (1991) Response of depression to very high plasma levels of imipramine plus desimpramine. Biol Psychiatry 30: 57–62
4. Garvey MJ, Tuason VB, Johnson RA, Valentine RH, Cooper TB (1984) Elevated plasma tricyclic levels with therapeutic dosis of imipramine. Am J Psychiatry 141: 853–856
5. Gelenberg AJ, Carroll JA, Baudhuin MG, Jefferson JW, GreistJH (1989) The meaning of serum lithium levels in maintenance therapy of mood disorders: a review of the literature. J Clin Psychiatry 50 [Suppl 12]: 17–22