1. C. Baikoussis, D. E. Blair and T. Koufogiorgos,A decomposition of the curvature tensor of a contact manifold satisfying R(X, Y)ζ=κ(η(Y)X-η(X)Y), Mathematics Technical Report, University of Ioannina, No 204, June 1992.
2. Lecture Notes in Mathematics;D. E. Blair,1976
3. D. E. Blair,Two remarks on contact metric structures, The Tôhoku Mathematical Journal29 (1977), 319–324.
4. D. E. Blair and J. N. Patnaik,Contact manifolds with characteristic vector field annihilated by the curvature, Bulletin of the Institute of Mathematics. Academia Sinica9 (1981), 533–545.
5. D. E. Blair,When is the tangent sphere bundle locally symmetric?, inGeometry and Topology, World Scientific, Singapore, 1989, pp. 15–30.