Electrospray mass and tandem mass spectrometry of homologous and isomeric singly, doubly, triply and quadruply charged cationic ruthenated meso-(phenyl)(m)-(meta- and para-pyridyl)(n) (m+n=4) macrocyclic porphyrin complexes - Tomazela, Daniela M.; Gozzo, Fabio Cesar; Mayer, Ildemar; Engelmann, Fábio Monaro; Araki, Koiti; Toma, Henrique Eisi; Eberlin, Marcos Nogueira (Journal of Mass Spectrometry, 2004)