10.6084/m9.figshare.7964495.v1 Ulrich J. Frey Ulrich J. Frey Long-term evidence on cooperation and cultural differences in public goods dilemmas - ESM The Royal Society 2019 human cooperation public goods game cultural differences long-term cooperation observer effect laboratory context 2019-04-08 09:12:18 Journal contribution https://rs.figshare.com/articles/journal_contribution/Long-term_evidence_on_cooperation_and_cultural_differences_in_public_goods_dilemmas_-_ESM/7964495 Long-term evidence on cooperation and cultural differences in public goods dilemmas - ESM