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1961 On differentiable manifolds with certain structures which are closely related to almost contact structure, II
Shigeo Sasaki, Yoji Hatakeyama
Tohoku Math. J. (2) 13(2): 281-294 (1961). DOI: 10.2748/tmj/1178244304
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Vol.13 • No. 2 • 1961
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