1. Anonymous (1982) The wealth of India: raw materials, vol. X. Publication and information directorate, CSIR, New Delhi, pp 78–81
2. Anonymous (1952) Wealth of India. A dictionary of Indian raw materials and industrial products, vol. 10. CSIR, New Delhi
3. Bach A, Pawłowska B (2003) Somatic embryogenesis in Gentiana pneumonanthe L. Acta Biol Crac Ser Bot 45(2):79–86
4. Bach A, Pawlowska B, Micor J (1994) Somatic embryogenesis of some genus of mono- and dicotyledonous ornamentals (in Polish). Prace Ogrodu Botanicznego PAN 5(6):433–437
5. Balaraju K, Agastian P, Ignacimuthu S (2009) Micropropagation of Swertia chirata Buch.-Hams. ex Wall.—a critically endangered medicinal herb. Acta physiol plant 31:487–494