⌂ See also the home page of the Legenda book series Studies In Yiddish

including:

15Three Cities of Yiddish: St Petersburg, Warsaw and Moscow
Edited by Gennady Estraikh and Mikhail Krutikov•3 April 2017
Chapter 8 Did Mikhail Epelbaum Study at Warsaw Conservatoire?: the Early Years of An Eminent Yiddish Singer
Alexander Frenkel
doi:10.2307/j.ctv16kkzrd.12