CYCLIZATION OF N,N-DIALKYLDITHIOCARBAMATE AND ALKYLXANTHATE DERIVATIVES OF POLYHALOGENATED PYRIDINES IN GAS AND LIQUID PHASES ArticleSamguina T.Yu., Lobodin V.V., Karakhanova N.K., Lebedev A.T., Sipyagin A.M.European Journal of Mass Spectrometry. Том 10. 2004. С. 57-62