temps (durée) (1) enquête (1) société (humaine) (1) recherche (1) âge (1) Instruments (1) Football fans (1) Violence (1) Time (1) Soccer fans (1) Sex (1) Research (1) Questionnaires (1) Perry (1) Measurement (1) Manufacturers' agents (1) Fans (1) Fanaticism (1) Crowds (1) Comprehension (1) Commission merchants (1) Aggressiveness (1) Age (1) Research (1) Measurement (1) Age (1)