References
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- Shawali , A. S. and Abdelhamid , A. O. 1975 . Tetrahedron Lett. , : 163
- Abdelhamid , A. O. , Hassaneen , H. M. and Shawali , A. S. 1983 . J. Heterocycl. Chem. , 20 : 719 and previous papers in the series
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