2 citations to https://www.mathnet.ru/eng/ejm1

1. Riccardo Moschetti, Gian Pietro Pirola, “Hurwitz spaces and liftings to the Valentiner group”, Journal of Pure and Applied Algebra, 222:1 (2018), 19  
2. V. I. Zvonilov, S. Yu. Orevkov, “Compactification of the Space of Branched Coverings of the Two-Dimensional Sphere”, Proc. Steklov Inst. Math., 298 (2017), 118–128