MathSciNet bibliographic data MR2176029 (2007a:57029) 57R17 (53D35) Allday, Christopher; Oprea, John A c-symplectic free $S\sp 1$$S\sp 1$-manifold with contractible orbits and ${\rm cat}=\frac12$${\rm cat}=\frac12$ DIM. Proc. Amer. Math. Soc. 134 (2006), no. 2, 599–604 (electronic). Article

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