1. Asami T, Ohyama T, Minamisawa K, Tsukihashi T (1989) New vegetable, yacon, containing a large quantity of fructo-oligosaccharide. Agric Hortic 64: 1033 1036 (in Japanese)
2. Hamada M, Hosoki T, Kusabiraki Y (1990) Mass-propagation of yacon (Polymnia sonchifolia) by repeated node culture. Plant Tissue Cult Lett 7: 35–37
3. Kanno M (1989) Cultivation of the medicinal plant, yacon. Agric Hortic 64: 538–540 (in Japanese)
4. Matsubara S, Ohmori Y, Takada Y, Komasadomi T (1990) Vegetative propagation of yakon by shoot apex, node and callus cultures. Sci Rep Fac Agric Okayama Univ 76: 1–6
5. Matsumoto Y, Matsubara S, Murakami K (1996) Regeneration of adventitious embryo from mesophyll callus in Polymnia.sonchiJolia. J Japan Soc Hortic Sci 65 (Suppl 11: 182–183 (in Japanese)