Transformations of 8-substituted tetrazolo[1,5-a]pyrazines [Electronic resource] / P. A. Slepukhin, G. L. Rusinov, S. Dedeneva, V. N. Charushin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2007. - Vol. 56, № 2. - P. 345-350. - URL: http://www.springerlink.com/content/px2u383631p78074/fulltext.pdf. - (Дата обращения: 26.10.2011)