شطيطح محمد, طالبي محمد الطاهر, حازي محمد, and بوضياف محمد. 2021. “The Use of Experimental Approach and the Semiotic Mediation, To Process Mathematical Situations in a Digital Environment. (The Composite of Two Central Symmetries As an example): تاريخ الاستلام: 13 02 2020 تاريخ القبول: 27 10 2020”. Human Resources Development Research 16 (04):690-712. https://rdrh.univ-setif2.dz/index.php/rdrh/article/view/418.