Références :
Alphs L.D, Daniel D.G, Velligan D, et al. The negative symptom assessment: a new instrument to assess negative symptoms of schizophrenia. Psychopharmacol Bull 1989; 25(2): 159-163.
Axelrod B.N, Goldman R.S, Alphs L.D. Validation of the 16-item Negative Symptom Assessment. J Psychiat Res 1993 Jul-Sep; 27(3): 253-258.
