Studia Thracica.Thracian and Scythian Cultural Relations. - Popov, V; Panajotov, I; Toncheva, G; Melyukova, A I; Chlenova, N L; Kozenkova, V I; Venedikov, I; Mantseevich, P; Ognenova-Marinova, L; Velkova, Z; Gocheva, Z; Yordanov, C; et al. (Academia litterarum bulgarica - Institutum Thracicum, 1975)