Gianluca Giorgi, Maurizio Anzini, Andrea Cappelli, Federico Corelli, Salvatore Vomero, "Characterization and differentiation of heterocyclic isomers. Part 2*. Mass spectrometry and molecular orbital calculations on pyrrolo[1,2-a][1,4]benzodiazepin-4-one, -6-one, and -4,6-dione", Journal of the American Society for Mass Spectrometry,
Vol 7, Iss 7, 1996, cтр. 653-663.
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dx.doi.org/10.1016/1044-0305(96)85611-X 
