Ullah, H. .; Salim Khan, M. .; Shah, Z. .; Fălădău, M. A. .; Fatima, N. .; Sarwar, M. .; Abodayeh, K. . Finite Element Multigrid Simulation of Natural Convection in Hybrid Nanofluids Within Isolated Cavity for Solar Energy Systems: A Machine Learning-Levenberg-Marquardt Approach. Contemp. Math. 2026, 7, 2030-2050.