https://www.smf-bg.com/bg-product-details-100279.html
EGIDIUS KWARTET, A PORTRAIT, CD
Bulgarian music company, with more than 25 years of experience in the field of harmonic vibrations :)
egidius kwartetportrait
https://research-portal.uu.nl/en/publications/de-leidse-koorboeken-vol-v-liner-notes-egidius-kwartet/
De Leidse Koorboeken, vol. V: liner-notes; Egidius Kwartet - Utrecht University
liner notesegidius kwartetutrecht universityleidsevol