Khachatryan, S.V. et al. 2009. PHASE TRANSFORMATION OF ARMENIAN ZEOLITES DURING HYDROTHERMAL MODIFICATION. Proceedings of the YSU C: Geological and Geographical Sciences. 43, 1 (218) (Apr. 2009), 3–8. DOI:https://doi.org/10.46991/PYSU:C/2009.43.1.003.