Here's the paper, with no paywall.

https://www.nature.com/articles/s41599-026-07536-x

Hopkins, J., Bardoel, E.A. & Djurkovic, N. The four-day workweek in Australia: insights from early adopters of the 100:80:100 model. Humanit Soc Sci Commun (2026). https://doi.org/10.1057/s41599-026-07536-x