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Gupta, V. K.; Gupta, Vandana; Gupta, J. K. Test function set for the convergence of double singular integral. (English) Zbl 1071.42501 Vikram Math. J. 19, 18-22 (1999). MSC: 42B20 PDFBibTeX XMLCite \textit{V. K. Gupta} et al., Vikram Math. J. 19, 18--22 (1999; Zbl 1071.42501)