Ioannis M. Takakis. Mass spectra of 1,2-alkylenedioxy-substituted and related benzofurazans and benzofuroxans: differentiation between linear and angular isomers // J. Mass. Spectrom. 34; 11; 1999; 1137 - 1153
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http://dx.doi.org/10.1002/(SICI)1096-9888(199911)34:11<1137::AID-JMS874>3.0.CO;2-4
