1)
J. Heterocyclic Chem 1995, Volume 32, pp. 585-590
Synthesis and Reactions of Dinitrated Amino and Diaminopyridines
H. Ritter, H. H. Licht
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https://www.jhetchem.com/cd2html.php?file=19950585
2)
J. Heterocyclic Chem1983, Volume 20, pp. 23-28
Methylpyridylbenzimidazoles. Part I. Mono, bis-Quaternary Salts and related Polymethyne Dyes
Ermanno Barni , Piero Savarino , Guido Viscardi, Ezio Pelizzetti
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https://www.jhetchem.com/cd2html.php?file=19830023
J. Heterocyclic Chem., 1986, Volume 23, pp. 209-221
Long Chain Heterocyclic Dyes. Part One. Hydrophobic Structures
Ermanno Barni [a], Piero Savarino [a], Raffaella Larovere [a], Guido Viscardi [a], Ezio Pelizzetti
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https://www.jhetchem.com/cd2html.php?file=19860209
J. Heterocyclic Chem., 24, 1053-1060 (1987)
Quaternary Salts and Polymethine Dyes from 2-(Methylpyridyl)-X-azolo[4,5-b]pyridine
Piero Savarino, Guido Viscardi, Ermanno Barni, Gaetano Di Modica
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https://www.jhetchem.com/cd2html.php?file=19871053