How coping mediates the effect of optimism on distress: a study of women with early stage breast cancer. - Carver,C.S.; Pozo,C.; Harris,S.D.; Noriega,V.; Scheier,M.F.; Robinson,D.S.; Ketcham,A.S.; Moffat,F.L.; Clark,K.C. (J Pers Soc Psychol, 1993)