Adedemi, R. E., Atindogbe, C. C. and Hounnonkpe, R. A. (2026) “$\widetilde{L_r}-$finite type null hypersurfaces in generalized Robertson-Walker spacetimes”, Calculation, 2(1), pp. 12–25. Available at: https://simadp.com/calculation/article/view/calcv2i1-2 (Accessed: 2August2026).