Haque, Ayesha, et al. “Isolation of Betulinic Acid and 2,3-Dihydroxyolean-12-En-28-Oic Acid from the Leaves of Callistemon Linearis”.
Dhaka University Journal of Science
, vol. 61, no. 2, Nov. 2013, pp. 211-2, doi:10.3329/dujs.v61i2.17073.