Structural studies of lithium 4,4-difluoro- and 4,4,4-trifluoro-3-oxybutenoates [Electronic resource] / P. A. Slepukhin, N. S. Boltacheva, V. I. Filyakova, V. N. Charushin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2009. - Vol. 58, № 6. - P. 1228-1232. - URL: http://www.springerlink.com/content/x707015pk711100r/fulltext.pdf. - (Дата обращения: 27.10.2011 г.)