Invariant Einstein metrics on Ledger-Obata spaces
  In this paper, we study invariant Einstein metrics on Ledger-Obata spaces $F^m/\operatorname{diag}(F)$. In particular, we classify invariant Einstein metrics on $F^4/\operatorname{diag}(F)$ and estimate the number of invariant Einstein metrics on general Ledger-Obata spaces $F^{m}/\operatorname{diag}(F)$. 
Zhiqi Chen, Yuri\u{i} Nikonorov, Yulia Nikonorova
math.DG