Citation: Tarantino, Serena C.; Giannini, Mattia; Carpenter, Michael A.; Zema, Michele (2016). Cooperative Jahn--Teller effect and the role of strain in the tetragonal-to-cubic phase transition in Mg~x~Cu~1{\hskip0.16667em~{-}{\hskip0.16667em}x}Cr~2~O~4~. IUCrJ, 3, pp. -.