Juharyan, A. 2018. THE PRINCIPLES OF CHOICE OF ARMENIAN OBSIDIAN SOURCES IN BRONZE AGE, OBTAINED BY pXRF ANALYSIS. Proceedings of the YSU C: Geological and Geographical Sciences. 52, 1 (245) (Apr. 2018), 20–26. DOI:https://doi.org/10.46991/PYSU:C/2018.52.1.020.