DAVIDYANTS, E. S. THE EFFECT OF PURIFIED AMOUNT OF TRITERPENE GLYCOSIDES AND THEIR ENRICHED EXTRACT FROM LEAVES OF SILPHIUM PERFOLIATUM L. ON THE GERMINATION OF SEEDS OF WINTER WHEAT AND THE ACTIVITY OF CATALASE IN THEM. chemistry of plant raw material, n. 2, p. 353-360, 10 Jun. 2021.