The paper I wrote together with Randolph Nesse about individual symptoms of depression and their differential impact on impairment of psychosocial functioning was just published in PLoS ONE.
» Fried, E. I. & Nesse, R. M. (2014). The Impact of Individual Depressive Symptoms on Impairment of Psychosocial Functioning. PLoS ONE, 9(2), e90311. (PDF)