00802naa#a2200193#i#450# EN\\bibl\19639 20241217033519.2 2222-7962 20171225b2017####ek#y0engy0150####ca RUS RU Improvement of the contract system in the sphere of purchase based on geological-economic monitoring Journal article Voronezh FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov 2017 9 с. Journal article local Сельское хозяйство. Лесное хозяйство. Охота. Рыбное хозяйство. 63 RUS Dadykin Valeriy Sergeevich Dadykina Olga Viktorovna anni.editorum.ru