Psychometric properties of the Greek version of the Schizotypal Personality Questionnaire (SPQ) in young male obligatory conscripts: a two years test–retest study - Stefanis, Nicholas C; Vitoratou, Silia; Ntzoufras, Ioannis; Smyrnis, Nikolaos; Evdokimidis, Ioannis; Stefanis, Costas N (Personality and Individual Differences, 2006)