A paper "Indirect reciprocity with dual private assessment" was published in PNAS

Indirect reciprocity with dual private assessment
Yukari Jessica Tham, Christian Hilbe, Yohsuke Murase
Proceedings of the National Academy of Sciences 123 (35) e2624656123 (2026)
Publication link: https://doi.org/10.1073/pnas.2624656123
Press release from RIKEN: https://www.riken.jp/press/2026/20260825_2/index.html
Press release from Kobe University: https://www.kobe-u.ac.jp/ja/news/article/20260825-68206/
For the full list, see the Publications page.