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Studies on Condensed-Heterocyclic Azolium Cephalosporins. I. Synthesis and Antibacterial Activity of 7.beta.-(2-(2-Aminothiazol-4-Yl)-2(z)-Alkoxyiminoacetamido)-3-(Imidazo(1,2-A)pyridinium-1-Yl)methyl-3-Cephem-4-Carboxylates.