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Langford, E. S. Some results on linear operators on lattice groups. (English) Zbl 0139.02501 Am. Math. Mon. 72, 841-846 (1965). Reviewer: J. A. H. Shepperd MSC: 06F20 PDFBibTeX XMLCite \textit{E. S. Langford}, Am. Math. Mon. 72, 841--846 (1965; Zbl 0139.02501) Full Text: DOI