Timofey V. Rodionov and Valeriy K. Zakharov, Lomonosov Moscow State University, Russia.
This set of two volumes evinces serious scholarship, and appears to do precisely what the authors set out to do, in homage to what Hausdorff did a century ago. It is a very valuable piece of work. Michael Berg in: MAA (09.2018), https: //www.maa.org/press/maa-reviews/sets-functions-measures-volume-1-fundamentals-of-set-and-number-theory