Levdanskiy, V. A., A. V. Levdanskiy, and B. N. Kuznetsov. “ISOLATION AND STUDY OF PROANTHOCYANIDINS FROM BARK OF CEDAR PÍNUS SIBÍRICA”. Chemistry of Plant Raw Material, no. 4, Dec. 2022, pp. 99-105, doi:10.14258/jcprm.20220411490.