The Almost Contact Metric Hypersurfaces with Small Type Numbers in W_4 -manifolds / M. B. Banaru. // Vestnik Moskovskogo Universiteta. Seriya 1. Matematika. Mekhanika. 2018. № 1. P. 67-70 [Moscow Univ. Math. Bulletin. Vol. 72, N 2, 2017. P. 38-40].

It is proved that the almost contact metric structures on a hypersurface with type number 1 and on a hypersurface with type number 0 are identical in a W_4 -manifold .

Key words: almost contact metric structure, type number, hypersurface, W_4-manifold .