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MASS-SPECTROMETRY STUDY OF LINEAR AND ANGULAR 3',4'-DIOXYSUBSTITUTED DIHYDROPYRANOCOUMARINS AND THEIR DERIVATIVES Article ZAKHAROV P.I., TERENTEV P.B., NIKONOV G.K., AVRAMENKO L.G. KHIMIYA PRIRODNYKH SOEDINENII. AKADEMIYA NAUK UZBEKSKOI SSR. 1977. P. 38-44