S. Khakpour, A. Motallebi-Azar, B. Hosseini, S. Alizadeh-Salte, and A. Hasani, “Optimization of micropropagation by different concentration of vitamins and sucrose in St. John’s Wort (Hypericum Perforatum)”, pb&ss, vol. 71, pp. 67–79, Jun. 2015.