The perturbed Fokas–Lenells equation with Kudryashov’s law of self-phase modulation having the spatiotemporal dispersionNeslihan Ozdemir, Aydin Secer, Muslum Ozisik and Mustafa BayramEur. Phys. J. Plus, 140 11 (2025) 1152DOI: https://doi.org/10.1140/epjp/s13360-025-07066-6