Anitha, B. S., and C. S. Bagewadi. “Invariant Submanifolds of Trans-Sasakian Manifolds”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 67, no. 10, Oct. 2015, pp. 1309-20, https://umj.imath.kiev.ua/index.php/umj/article/view/2068.