“THE PRINCIPLES OF CHOICE OF ARMENIAN OBSIDIAN SOURCES IN BRONZE AGE, OBTAINED BY pXRF ANALYSIS”, Proc. YSU C: Geol. Geogr. Sci., vol. 52, no. 1 (245), pp. 20–26, Apr. 2018, doi: 10.46991/PYSU:C/2018.52.1.020.