?,?-N,N-DIMETHYLAMINOALKYLAMINES AS POSSIBLE DERIVATIZATION AGENTS FOR THE ANALYSIS OF SMALL CARBONYL COMPOUNDS BY LOW ENERGY MASS SPECTROMETRY СтатьяZhilyaev D.I., Borisov R.S., Polovkov N.Yu., Zaikin V.G.European Journal of Mass Spectrometry. Том vol 22. 2016. С. 151-158