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Zhu, Zhi Biao and Gao, Shan and Ng, Seik Weng (2011) 4-Aminopyridinium-3-sulfonate monohydrate. Acta Crystallographica Section E: Structure Reports Online, 67 (2). o456. ISSN 1600-5368, DOI https://doi.org/10.1107/S1600536811002145.
Zhu, Zhi Biao and Gao, Shan and Ng, Seik Weng (2011) 4-Hydroxypyridinium-3-sulfonate. Acta Crystallographica Section E: Structure Reports Online, 67 (1). o11. ISSN 1600-5368, DOI https://doi.org/10.1107/S1600536810049603.