1. M. Allaoui, A. El Amrouss and A. Ourraoui, "Three solutions for a quasi-linear elliptic problem", Applied mathematics e-notes, vol. 13, pp. 51-59, 2013. [On line]. Available: https://bit.ly/34lMJXS
2. R. Ayazoglu, G. Alisoy and I. Ekincioglu, "Existence of one weak solution for p(x)−Biharmonic equations involving a concave-convex nonlinearity", Matematički vesnik, vol. 69, no. 4, pp. 296-307, Dec. 2017. [On line]. Available: https://bit.ly/2RWAhLI
3. A. Ayoujil and A. Elamrouss, "Multiple solutions for a Robin problem involving the p(x)−biharmonic operator", Analele Universităţii din Craiova. Seria matematică, informatică vol. 44, no. 1, pp. 87-93, 2017. [On line]. Available: https://bit.ly/35qjbcW
4. M. Alimohammady and F. Fattahi, "Existence of solutions to hemivariational inequalities involving the p(x)−Biharmonic operator", Electronic journal of differential equations, Vol. 2015, Art. ID 79, 2015. [On line]. Available: https://bit.ly/35pW9CP
5. M. Boureanua, V. Rǎdulescu and B. Repovš, "On a p(·)−biharmonic problem with no-flux boundary condition", Computers & mathematics with applications, vol. 72, no. 9, pp. 2505-2515, Nov. 2016, doi: 10.1016/j.camwa.2016.09.017.