Guyumjyan, H.P., and Sh.V. Khachatryan. “STRUCTURAL AND GENESIS FEATURES OF SECONDARY QUARTZITE OF COPPER-PORPHYRITIC KASHEN DEPOSIT: (MARTAKERT REGION, NAGORNO-KARABAKH REPUBLIC)”. Proceedings of the YSU C: Geological and Geographical Sciences, vol. 49, no. 1 (236), Apr. 2015, pp. 3-10, doi:10.46991/PYSU:C/2015.49.1.003.