Juharyan, A.K. “THE PRINCIPLES OF CHOICE OF ARMENIAN OBSIDIAN SOURCES IN BRONZE AGE, OBTAINED BY PXRF ANALYSIS”. Proceedings of the YSU C: Geological and Geographical Sciences, vol. 52, no. 1 (245), Apr. 2018, pp. 20-26, doi:10.46991/PYSU:C/2018.52.1.020.