1. M. Aamri, S. Bennari and D. El Moutawakil, , Siberian Electronic Mathematical Reports (2006) 137-142.
2. M. Aamri and D. El Moutawakil, , Acta Mathematica Academiae Peadegogicae\ Nyiregyhaziensis (2004) 83-91.
3. O. Alqahtani and E. Karapinar, , Filomat (2019) 4837--4843.
4. H. Argoubi, B. Samet and C. Vetro, , J. Nonlinear Sci. Appl. (2015) 1082--1094.
5. J.G. Heidary, A. Farajzadeh, M. Azhini and F. Khojasteh, , Sahand Commun. Math. Anal. (SCMA) (2019) 129--148.