Comment on ″Optical soliton to multi-core (coupling with all the neighbors) directional couplers and modulation instability″ [Eur.Phys.J.Plus(2021)136:325]
Eur. Phys. J. Plus, 137 4 (2022) 483
Published online: 19 April 2022
DOI: 10.1140/epjp/s13360-022-02544-7