Fragmentation of diketopiperazines from Aspergillus fumigatus by electrospray ionization tandem mass spectrometry (ESI-MS/MS) - Furtado, Niege A. J. C.; Vessecchi, Ricardo; Tomaz, José Carlos; Galembeck, Sérgio Emanuel; Bastos, Jairo Kenupp; Lopes, Norberto Peporine; Crotti, Antonio Eduardo Miller (Journal of Mass Spectrometry, 2007)