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