Troisi A, Pasini A, Bersani G, Di Mauro M, Ciani N (Mai 1991). „Negative symptoms and visual behavior in DSM-III-R prognostic subtypes of schizophreniform disorder”. Acta Psychiatr Scand. 83 (5): 391–4. doi:10.1111/j.1600-0447.1991.tb05562.x. PMID1853733.Verificați datele pentru: |date= (ajutor)
Troisi A, Pasini A, Bersani G, Di Mauro M, Ciani N (Mai 1991). „Negative symptoms and visual behavior in DSM-III-R prognostic subtypes of schizophreniform disorder”. Acta Psychiatr Scand. 83 (5): 391–4. doi:10.1111/j.1600-0447.1991.tb05562.x. PMID1853733.Verificați datele pentru: |date= (ajutor)