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To friend and fellow searcher Otto Kegel on the occasion when his years can be grouped perfectly
The author is indebted to C. De Vivo for clarifying discussions in Naples in March 1994.
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Heineken, H. Groups with all quotient groups lagrangian. Arch. Math 64, 97–102 (1995). https://doi.org/10.1007/BF01196626
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DOI: https://doi.org/10.1007/BF01196626