Guyumjyan, H. P.; Voskanyan, S. V. GEOLOGICAL-PETROGRAPHYCAL CHARACTERISTIC AND THE MAIN GENESIS FEATURES OF THE SECONDARY QUARTZITES OF PKHRUT-LERNADZOR’S ORE DEPOSITE: (Syunik Marz, Armenia). Proc. YSU C: Geol. Geogr. Sci. 2010, 44, 18-24.