an Entity references as follows:
Compositions / Lazar Nikolov, comp.; Tsvetana Ivanova, Dragomir Yossifov, p; Alexander Ilchev, Kevork Mikaelian, vl; Valentin Gerov, alto... [et al.]; ensemble of Prof. Zdravko Yordanov's students, ens. instr.; Dragomir Yossifov, dir.