Bulletin of the Malaysian Mathematical Sciences Society (Bull. Malays. Math. Sci. Soc.) (20240101), 47, no.~1, Paper No 26, 19~pp. ISSN: 0126-6705 (print).eISSN: 2180-4206.
Differential Equations and Dynamical Systems. International Journal for Theory, Real World Modelling and Simulations (Differ. Equ. Dyn. Syst.) (20240101), 32, no.~2, 363-375. ISSN: 0971-3514 (print).eISSN: 0974-6870.