Haque, A., Siddiqi, M. M. A., Rahman, A. M., Hasan, C. M. and Chowdhury, A. S. (2013) “Isolation of Betulinic Acid and 2,3-Dihydroxyolean-12-en-28-oic Acid from the Leaves of Callistemon linearis”, Dhaka University Journal of Science, 61(2), pp. 211–212. doi: 10.3329/dujs.v61i2.17073.