Pitchot, W., Hansenne, M., Gonzalez-Moreno, A., von Frenckell, R., & al., et. (1990). Psychopathological correlates of dopaminergic disturbances in major depression. Neuropsychobiology, 24(4), 169–172. http://www.karger.ch/journals/nps/nps\_jh.htm