Synthesis and Characterization of Mono-, Bis-, and Trissubstituted Pyridinium and Pyrylium Dyes
Masaki Matsui, Shigeo Kawamura, Katsuyoshi Shibata and Hiroshige Muramatsu
Bulletin of the Chemical Society of Japan Vol. 65 (1992) , No. 1 pp.71-74
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http://dx.doi.org/10.1246/bcsj.65.71