Demirchyan, A. R. “INVESTIGATION OF REOLITE-DATSITE TUFFS OF TASHIR AND ORGANIZING THE PRODUCTION OF SILICATE POTASSIUM CONTAINING CHLORINELESS FERTILIZERS IN VANADZOR”. Proceedings of the YSU C: Geological and Geographical Sciences 43, no. 1 (218) (April 20, 2009): 25–29. Accessed November 22, 2024. https://pub.ysu.am/index.php/proceedings-geol-geogr/article/view/vol43_no1_2009_pp025-029.