MathSciNet bibliographic data MR1181312 (93i:57036) 57R22 (53C15 57R15 58F05) Geiges, Hansjörg Symplectic structures on \$T\sp 2\$$T\sp 2$-bundles over \$T\sp 2\$$T\sp 2$. Duke Math. J. 67 (1992), no. 3, 539–555. Article

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