A fractionally time-delayed SD-Van der Pol oscillator with a non-perturbative approach Yusry O. El-Dib, Nasser S. Elgazery and Haifa A. Alyousef EPL, 142 4 (2023) 42001 Published online: 16 May 2023 DOI: 10.1209/0295-5075/acd20e