Левданский, В. А., & Левданский, А. В. (1). EXTRACTION OF BETULIN BY ALIPHATIC ALCOHOLS C3-C4 FROM AN EXTERNAL LAYER OF A BIRCH BARK HYDROLYZED IN AQUEOUS ALKALINE SOLUTION. Chemistry of Plant Raw Material, (1), 131-137. https://doi.org/10.14258/jcprm.1401131