MathSciNet bibliographic data MR397734 (53 #1592) 57A10 Birman, Joan S.; Craggs, R. On the $\mu$$\mu$-invariant of $Z$$Z$-homology $3$$3$-spheres. Bull. Amer. Math. Soc. 82 (1976), no. 2, 253–255. Article

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