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Kamal Usef Sadek, Maghraby Ali Selim, Mohamed Hilmy Elnagdi and Hans Hartwig Otto. Studies on Fused Azoles: Synthesis of Several New Polyfunctionally Substituted Fused Pyrazoles Bul*letin of the Che*mical So*ciety of Ja*pan V. 66, 1993 , N 10 p.2927-2930
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http://dx.doi.org/10.1246/bcsj.66.2927