Multifractal analysis on age-based discrimination in X-ray images for sensing the severity of COVID-19 diseaseShaobo He, C. Thangaraj, D. Easwaramoorthy and G. MuhiuddinEur. Phys. J. Spec. Top., 231 18-20 (2022) 3663-3671DOI: https://doi.org/10.1140/epjs/s11734-022-00615-5