A good definition of negative v depressive symptoms

https://books.google.co.uk/books?id=tz_MdRYNSI0C&pg=PA121&lpg=PA121&dq=negative+symptoms+vs+depression&source=bl&ots=U8eJZSOTnI&sig=mlTFyRSLwhb-Duj6OHRCMXJh3s8&hl=en&sa=X&ei=Ptu_VOfjOoOV7AaynYHoDw&ved=0CDAQ6AEwAjge#v=onepage&q=negative%20symptoms%20vs%20depression&f=false

scroll down to table 1.

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