Khachatryan, Sh. V., R. G. Gevorgyan, and H. H. Sargsyan. 2009. “PHASE TRANSFORMATION OF ARMENIAN ZEOLITES DURING HYDROTHERMAL MODIFICATION”. Proceedings of the YSU C: Geological and Geographical Sciences 43 (1 (218). Yerevan, Armenia:3-8. https://doi.org/10.46991/PYSU:C/2009.43.1.003.