I N, S H, A. Hadi H, Awang K. Ab initia Geometry-Optimization and NMR Studies of Chemical Constituents of Piper sarmentosum. Malaysian J. Sci. [Internet]. 2002 Apr. 25 [cited 2024 Nov. 21];21(1&2):143-7. Available from: http://ojie.um.edu.my/index.php/MJS/article/view/8600