Physicochemical properties of Betulin and CO2 extract from birch bark Ur'yash, V. F. ; Kokurina, N. Yu. ; Larina, V. N. ; Kashtanov, E. A. ; Gruzdeva, A. E. Abstract Publication: Russian Journal of Physical Chemistry B Pub Date: December 2014 DOI: 10.1134/S1990793114080181 Bibcode: 2014RJPCB...8.1100U