1. ^Daniel Jaffé - Historical Dictionary of Russian Music 2012- Page 328 "He became a friend of the poet Joseph Brodsky, who introduced him to the work of Anna Akhmatova. Tishchenko set her Requiem cycle, Akhmatova's unpublished “underground” memorial to the victims of Stalin's Terror. Written for two voices ..."
2. ^Valeria Tsenova - Underground Music from the Former USSR 2014 -- Page 53 1134371586 "As for his own work, it was a high act of civic spirit to write Requiem to the lyrics of Anna Akhamatova, another remarkable ... convey to the listeners the entire poetical text of Anna Akhmatova without turning his music into an illustration to her verse."
3. ^Pauline Fairclough - Shostakovich Studies 2 2010 -0521111188 Page 196 "We should add here the Requiem of 1966 by Shostakovich's pupil Boris Tishchenko for soprano, tenor and orchestra based on poems of Anna Akhmatova; like Shostakovich's symphony, it is a setting of selected verses in a non-standard .."