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4. Awad, W. I.; Hashem, A. I. / Halogenated phthalic anhydride derivatives // Egyptian Journal of Chemistry, 1973, Vol. 16, 4, 297-306.
5. Afify, A. A.; Soliman, A. Y.; El-Hashash, M. A.; Sayed, G. H.; Amer, M. M. / Synthesis and reactions of 4-(3',4',5',6'-tetrahalophthalylidene)-2-aryl-5(4)-oxazolones // Oriental Journal of Chemistry, 1987, Vol. 3, 1, 99-104.