Mkrtchyan, H. H., and A. A. Avetisyan. “ESTIMATION OF QUALITY APPROBATION OF ORE OF HANQAVAN MOLYBDENUM DEPOSITS”. Proceedings of the YSU C: Geological and Geographical Sciences, vol. 43, no. 1 (218), Apr. 2009, pp. 20-24, doi:10.46991/PYSU:C/2009.43.1.020.