Schdeva, R., R. Kumar, and S. S. Bhatia. “Totally Contact Umbilical Slant Lightlike Submanifolds of Indefinite Kenmotsu Manifolds”. Tamkang Journal of Mathematics, vol. 46, no. 2, June 2015, pp. 179-91, doi:10.5556/j.tkjm.46.2015.1727.