Davidyants E. S. THE EFFECT OF PURIFIED AMOUNT OF TRITERPENE GLYCOSIDES AND THEIR ENRICHED EXTRACT FROM LEAVES OF SILPHIUM PERFOLIATUM L. ON THE GROWTH AND ACTIVITY OF NITRATE REDUCTASE OF WIN-TER WHEAT PLANTS // Chemistry of plant raw material, 2019, № 4. P. 441-448 DOI: 10.14258/jcprm.2019045482. URL: https://journal.asu.ru/cw/article/view/5482.