Three-spin systems and the Pusey–Barrett–Rudolph theorem Zeynab Faroughi, Ali Ahanj, Samira Nazifkar and Kurosh Javidan Eur. Phys. J. Plus, 136 9 (2021) 941 Published online: 14 September 2021 DOI: 10.1140/epjp/s13360-021-01913-y