G. Brahmachari, S. Mondal, A. Gangopadhyay, D. Gorai, B. Mukhopadhyay, S. Saha and A. K. Brahmachari, “Swertia (Gentianaceae): chemical and pharmacological aspects”, Chem Biodivers, Vol. 1, 2004, pp. 1627-1651.
 P. Joshi and V. Dhawan, “Axillary multiplication of Swertia chirayita (Roxb. Ex Fleming) H. Karst., a critically endangered medicinal herb of temperate Himalayas ”, In Vitro Cell Dev Biol-Plant, Vol. 43, 2007, pp. 631-638.
 A. Fiuk and J. J. Rybczynski, “Genotype and plant growth regulator-dependent response of somatic embryogenesis from Gentiana spp. leaf explants”, In Vitro Cell Dev Biol-Plant, Vol. 44, 2008, pp. 90-99.
 H. Doi, R. Takahashi, T. Hikage and Y. Takahata, “Embryogenesis and doubled haploid production from anther culture in gentian (Gentiana triflora)”, Plant Cell Tissue Organ Cult, Vol. 102, 2010, pp. 27-33.
 T. He, L. N. Yang and Z. G. Zhao, “Embryogenesis of Gentiana straminea and assessment of genetic stability of regenerated plants using inter simple sequence repeat (ISSR) marker”, Afr J Biotechnol, Vol. 10, 2011, pp. 7604-7610.
 M. Capuana, G. Petrini, A. D. Marco and R. Giannini, “Plant regeneration of common ash (Fraxinus excelsior L.) by somatic embryogenesis”, In Vitro Cell Dev Biol-Plant, Vol. 43, 2007, pp. 101-110.
 F. N. Xiang, M. Q. Xing, G. M. Xia, F. Z. Hu and Y. Li, “Tissue culture and antihepatis constituent in calli of Swertia franchetiana H. smith”, Bullet Botanical Research, Vol. 19, 1999, pp. 172-179.
 N. P. Makunga and J. V. Staden, “An efficient system for the production of clonal plantlets of the medicinally important aromatic plant : Salvia africanalutea L”, Plant Cell Tissue Organ Cult, Vol. 92, 2008, pp. 63-72.
 A. P. A. Vaz, R. C. L. Figueiredo-Ribeiro and G. B. Kerbauy, “Photoperiod and temperature effects on in vitro growth and flowering of P. pusilla, an epiphytic orchid”, Plant Physiol Bioch, Vol. 42, 2004, pp. 411-415.