The Small World of Psychopathology Borsboom, Denny ; Cramer, Angélique O. J. ; Schmittmann, Verena D. ; Epskamp, Sacha ; Waldorp, Lourens J. Abstract Publication: PLoS ONE Pub Date: November 2011 DOI: 10.1371/journal.pone.0027407 Bibcode: 2011PLoSO...627407B