Jadoon A, Chiu CC, McDermott L, Cunningham P, Frangou S, Chang CJ, Sun IW, Liu SI, Lu ML, Su KP, Huang SY, Stewart R. Associations of polyunsaturated fatty acids with residual depression or anxiety in older people with major depression. J Affect Disord. 2012 Feb;136(3):918–25. doi: 10.1016/j.jad.2011.09.007. PMID: 22113178.