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The research of the first author was partially supported by a grant from NSF.
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Isaacs, I.M., Zisser, I. Squares of characters with few irreducible constituents in finite groups. Arch. Math 63, 197–207 (1994). https://doi.org/10.1007/BF01189820
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DOI: https://doi.org/10.1007/BF01189820