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Homotopy equivalent group representations and Picard groups of the burnside ring and the character ring. Tammo Tom Dieck (1978/1979) Manuscripta mathematica
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Representation types and 2-primary homotopy groups of certain compact Lie groups. Davis, Donald M. (2003) Homology, Homotopy and Applications
The e-invariant and the spectrum of the Lapacian for compact nilmanifolds covered by Heisenberg groups. W. Singhof, Ch. Deninger (1984) Inventiones mathematicae
The Smale invariant of a knot. John F. Hughes, Paul M. Melvin (1985) Commentarii mathematici Helvetici