Huynh, S., and M. Vo. “STUDY ON SOMATIC EMBRYOGENESIS OF CALLUS IN POLYGONUM MULTIFLORUM THUNB. LEAF IN VITRO”. VNUHCM Journal of Science and Technology Development, Vol. 12, no. 17, Nov. 2009, pp. 81-85, doi:https://doi.org/10.32508/stdj.v12i17.2370.