Grigoryan, A.T. 2010. OPTIMIZATION PROBLEMS OF WINTER WHEAT CROP DАTES IN ALTITUDE ZONES IN THE REPUBLIC OF ARMENIA. Proceedings of the YSU C: Geological and Geographical Sciences. 44, 1 (221) (Mar. 2010), 40–45. DOI:https://doi.org/10.46991/PYSU:C/2010.44.1.040.