“Isolation of Betulinic Acid and 2,3-Dihydroxyolean-12-en-28-oic Acid from the Leaves of Callistemon linearis”, Dhaka Univ. J. Sci., vol. 61, no. 2, pp. 211–212, Nov. 2013, doi: 10.3329/dujs.v61i2.17073.