Jassim, E. H. ., & Ameen, S. K. M. . (2014). Influence of L-Tryptophan and salicylic acid on secondary metabolites production from leaves induced callus of Catharanthus roseus L.G.Don in vitro. Journal of Biotechnology Research Center, 8(2), 35–43. https://doi.org/10.24126/jobrc.2014.8.2.326