Pantographic formulation of a nonlinear system of fractional order with delays and examination of its controllabilityIrshad Ahmad, Saeed Ahmad, Ghaus ur Rahman, Yeliz Karaca and Mati ur RahmanEur. Phys. J. Spec. Top., 232 14-15 (2023) 2619-2627DOI: https://doi.org/10.1140/epjs/s11734-023-00939-w