RT Article T1 Judgemental competence of individuals and groups in a dichotomous choice situation: Is a maority of heads better than one? JF The journal of mathematical sociology VO 61 IS 1 SP 47 OP 60 A1 Grofman, Bernard 1944- LA English YR 1978 UL https://krimdok.uni-tuebingen.de/Record/1912601281 DO 10.1080/0022250X.1978.9989880