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The author would like to thank Johannes Gutenberg University, West Germany, the Senior Research Council, Great Britain, and the National Science Foundation, USA, for partial support while this research was carried on
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Berger, T.R. Normal fitting pairs and Lockett's conjecture. Math Z 163, 125–132 (1978). https://doi.org/10.1007/BF01214059
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DOI: https://doi.org/10.1007/BF01214059