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Dankelmann, Peter; Volkmann, Lutz Minimum size of a graph or digraph of given radius. (English) Zbl 1197.05076 Inf. Process. Lett. 109, No. 16, 971-973 (2009). MSC: 05C35 05C20 05C12 PDFBibTeX XMLCite \textit{P. Dankelmann} and \textit{L. Volkmann}, Inf. Process. Lett. 109, No. 16, 971--973 (2009; Zbl 1197.05076) Full Text: DOI