@article{Vladimirov2013efficiency,
author={Vladimirov, S..},
title={Efficiency of use of increasing doses of mineral and organic fertilizers on potato  in the middle Volga steppe},
journal={Vestnik of Kazan State Agrarian University},
publisher={Kazan state agrarian University},
year={2013},
pages={92-95},
volume={8},
issue={3},
}