I am a 2nd year PhD student in applied Mathematics at Laboratory of Mathematical Modelling and Numeric in Engineering Sciences (LAMSIN) in the University of Tunis El Manar. My PhD thesis focuses on Inverse problem for elliptic operators. Specifically, my interests  consists in establishing estimates of stability in the determination of the coefficients of perturbations appearing in polyharmonic operator. My PhD is supervised by Mourad Bellassoued.