The polychromy in the painted decoration of the Thracian tombs, 5th - 3rd centuries B.C - Chichikova, M. (Color and cultural heritage '95. International conference, Varna 12 - 14 September 1995. Compilation of reports. Cvjat i kulturno nasledstvo '95. Meždunarodna konferencija, Varna 12 - 14 septemvri 1995 godina. Sbornik dokladi)