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O’Regan, D. Continuation principles and \(d\)-essential maps. (English) Zbl 1043.47511 Math. Comput. Modelling 30, No. 11-12, 1-6 (1999). MSC: 47H10 47J05 54C08 54H25 55M10 PDFBibTeX XMLCite \textit{D. O'Regan}, Math. Comput. Modelling 30, No. 11--12, 1--6 (1999; Zbl 1043.47511) Full Text: DOI