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. Yerevan, Armenia, 44(1 (221), pp. 40–45. doi: 10.46991/PYSU:C/2010.44.1.040.