Chen Y, Qian J, Wang J, Xia L, Zahavi G. OPRA: An Open-Source Online Preference Reporting and Aggregation System. AAAI [Internet]. 2021May18 [cited 2024Apr.19];35(18):16011-3. Available from: https://ojs.aaai.org/index.php/AAAI/article/view/17996