Reference

P. Bogani, M. Buiatti, S. Tegli, M.G. Pellegrini, P. Bettini, A. Scala (1985/1986): Interspecific Differences in Differentiation and Dedifferentiation Patterns in the Genus Nicotiana – Österreichische Botanische Zeitschrift = Plant Systematics and Evolution – 151: 19 - 29.