1. Smirnova DA. Negative symptoms of schizophrenia in the focus of the researcher, clinician and patient. Psychiatria. 2014;4(64):66-80. (In Russ.)
2. Imanbekov KO. The structure of deficit disorders in schizophrenia (literature review). Voprosi Mentalnoy Medicini i Ecologii. 2009;15(3):40-43. (In Russ.)
3. Haslam J. Observations on madness and melancholy. London: J Callow; 1809
4. Pearce JM. Positive and negative cerebral symptoms: the roles of Russell Reynolds and Hughlings Jackson. J Neurol Neurosurg Psychiatry. 2004;75:8:1148
5. Jackson JH. On temporary mental disorders after epileptic paroxysms. West Riding Lunatic Asylum Med Rep. 1885;5:105-129