Prolonged grief disorder: Psychometric validation of criteria proposed for DSM-V and ICD-11.
Prigerson HG, Horowitz MJ, Jacobs SC, Parkes CM, Aslan M, Goodkin K, Raphael B, Marwit SJ, Wortman C, Neimeyer RA, et al. PLoS Med. 2009 Aug; 6(8):e1000121. Epub 2009 Aug 4.