Кузьмин/Kuzmin П.А. and Носырева/Nosyreva Е.В. 2018. A STUDY OF THE ASCORBIC ACID CONTENT AND ACTIVITY OF COPPER-CONTAINING ENZYMES IN LEAVES OF SORBUS AUCUPARIA L. IN THE CONDITIONS OF THE KAMA REGION. Bulletin of Perm University. Biology. 1 (Oct. 2018), 88–92.