___

• [1] Bejancu A. and Papaghiuc N., Semi-invariant submanifolds of a Sasakian manifold, Ann. St. Univ. ”Al.I.Cuza” Iasi 27(1981), 163-170.
• [2] Blair D.E., Contact Manifolds in Riemannian Geometry, Lecture Notes in Mathematics, 509 Springer-Verlag, Berlin, 2003.
• [3] Calin C., CR-submanifolds of a nearly cosymplectic manifold, Publ. Math. Debrecen 45 (1994), 225-237.
• [4] Calin C., Contact CR-submanifold of quasi-Sasakian manifolds, Bull. Math. Soc. Sci. Math.Roumanie 36(84)(1992),217-226.
• [5] Calin C., Geometry of leaves on a CR-submanifold of a quasi-Sasakian manifold, Bul. I. P. Iasi Tom XL(XLIV)Fasc.1-4(1994),37-44.
• [6] Calin C., Normal contact CR-submanifolds of a quasi-Sasakian manifold, Publ. Math. Debrecen 53/3-4 (1998),257-270.
• [7] Calin C., Normal contact CR-submanifolds of a trans-Sasakian manifold,Bul. Inst. Poli. Din Iasi Tom XLII(XLVI) Fasc. 1-2,1996,9-15.
• [8] Calin C., Semi-invariant submanifolds of a quasi K-Sasakian manifolds,Ann. St. Univ. ”Al.I.Cuza” Iasi Tom XLII,(1996),95-103.
• [9] Ch. Baikoussis, D. E. Blair and Th. Koufogiorgos, A decomposition of the curvature tensor of a contact manifold satisfying R(X, Y )ξ = k(η(Y )X − η(X)Y ), Mathematics Technical Report, University of Ioanniana, No.204,June 1992.
• [10] Chen B.Y., Geometry of submanifolds, Pure and Applied Mathematics, No. 22. Marcel Dekker, Inc.New York, 1973.
• [11] Tanno S., Ricci curvatures of contact Riemannian manifolds, Tohoku Mathematical Journal 40(1988), 441-448.
• [12] Yano K. and Kon M., CR-submanifolds of Kaehler and Sasakian manifolds, Birkhauser,Boston,1983.