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Chanda, A.; Mondal, S.; Dey, L. K.; Karmakar, S. \(C^\ast\)-algebra-valued contractive mappings with its application to integral equations. (English) Zbl 1489.54090 Indian J. Math. 59, No. 1, 107-124 (2017). MSC: 54H25 54E40 45G10 PDFBibTeX XMLCite \textit{A. Chanda} et al., Indian J. Math. 59, No. 1, 107--124 (2017; Zbl 1489.54090)