Sigma(H)-Adducts of N-alkylpyrazinium and quinoxalinium salts with nucleophiles. The 1H and 13C NMR spectra and the crystal structures of P-adducts [Electronic resource] / E. V. Verbitskiy, M. V. Berezin, P. A. Slepukhin, G. L. Rusinov, V. N. Charushin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2009. - Vol. 58, № 1. - P. 176-181. - URL: http://www.springerlink.com/content/r50uh32j74487057/fulltext.pdf. - (Дата обращения: 28.10.2011 г.)