In the later period, buttresses were added to support the northwestern and southwestern corners of the vestibule
CJA documentation;
Jewish Cemeteries, Synagogues, and mass grave sites in Ukraine. United States Commission for the Preservation of America's Heritage Abroad (Washington D.C., 2005);
Boris Khaimovich, "Istoriko-etnographicheskie ekspeditsii Peterburgskogo evreiskogo universiteta," in: V.A.Dymshitz (ed.), Istoriia evreev na Ukraine i v Belorussii: ekspeditsii, pamiatniki, nakhodki (=Trudy po iudaike, issue 2) (St. Petersburg, 1994), p. 25-26 with ill.;
Rossiiskaia evreiskaia entsiklopediia (Moscow), vol. 4 - 2000, p. 507 with ill.
https://jewish-heritage-europe.eu/2019/11/16/ukraine-fire-destroys-former-great-synagogue-in-illintsi/