MathSciNet bibliographic data MR1079895 55R50 (57R20) Li, Bang He; Duan, Hai Bao Spin characteristic classes and reduced $K{\rm Spin}$$K{\rm Spin}$ group of a low-dimensional complex. Proc. Amer. Math. Soc. 113 (1991), no. 2, 479–491. Article

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