Kodai Mathematical Journal · 1970 · 42 citations · 9 references
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be a (2^+2)-dimensional almost Hermitian manifold, that is, M 2n+2 carries a tensor field / of type (1,1) such that
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The theory of quasi-Sasakian structures
David E. Blair · Journal of Differential Geometry · 1967 · 223 citations
Hypersurfaces in almost contact manifolds
David E. Blair, Gerald D. Ludden · Tohoku Mathematical Journal · 1969 · 36 citations · Full text