Fluorine-containing Heterocycles. XI. 5(6)-Fluoro-6(5)-X-benzofuroxans: Synthesis, Tautomerism, and Transformations [Electronic resource] / O. N. Chupakhin, S. K. Kotovskaya, S. A. Romanova, V. N. Charushin // Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2004. - Vol. 40, № 8. - P. 1167-1174. - URL: http://www.springerlink.com/content/uv013024tj74t50x/fulltext.pdf. - (Дата обращения: 28.10.2011 г.)