B. B. Chaturvedi, and P. N. Pandey. “Riemannian Manifold With a Special Type of Semi-Symmetric Non-Metric Connection”. Journal of International Academy of Physical Sciences, vol. 13, no. 3, Sept. 2009, p. 253-9, https://www.iaps.org.in/journal/index.php/journaliaps/article/view/190.