Duc Thien Dao, Quoc Thang Le, and Thanh Tam Nguyen. “Nitrogen-Containing Heterocyclic Compounds from the Roots of Callerya Speciosa”. Vietnam Journal of Science, Technology and Engineering, vol. 64, no. 3, Sept. 2022, pp. 49-52, doi:10.31276/VJSTE.64(3).49-52.