Ambident Properties of 4-Substituted Thiosemicarbazides in Condensations with Fluoroacetic Acids [Electronic resource] / E. B. Vasil'eva, V. I. Filyakova, L. P. Sidorova, I. E. Filatov, V. N. Charushin // Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2005. - Vol. 41, № 10. - P. 1522-1525. - URL: http://www.springerlink.com/content/p7574p020027611h/fulltext.pdf. - (Дата обращения: 31.10.2011 г.)