Alyaa A. Shalaby
A New Approach for the Synthesis of Some Fused Pyrazolo-, Triazolo-, Tetrazolo-, Diazepino-, Oxazepino-, and Thiazepinopyridazine Derivatives
Phosphorus, Sulfur, and Silicon and the Related Elements, Volume 178, Issue 2 February 2003 , pages 199 - 210
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http://dx.doi.org/10.1080/10426500307951