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MASS-SPECTROMETRY IDENTIFICATION OF LINEAR AND ANGULAR 3'-KETO-2', 2'-DIMETHYLDIHYDROPYRANOCOUMARINS Article ZAKHAROV P.I., TERENTJEV P.B., NIKONOV G.K. KHIMIYA PRIRODNYKH SOEDINENII. AKADEMIYA NAUK UZBEKSKOI SSR. 1977. P. 664-668