Informācija no mākslas organizācijas (pārbaudījusi Operabase)
«Orenburg Seasons Of Denis Matsuev», Hibla Gerzmava, Alexander Knyazev, Alexander Sladkovsky by Shostakovich, Tchaikovsky, P. I., No (2012/2012), Diriģents Alexander Sladkovsky, The Concert Hall Of The Orenburg Regional Philharmonic Society, Seville