Khalifa Mohammad Helal. A FORMULATION OF THE DIFFERENTIAL CONSTITUTIVE EQUATION OF OLDROYD-B FLUID AND WRITING PROGRAMMING CODE IN FREEFEM++ TO SOLVE IT BASED ON FINITE ELEMENT METHOD CONSIDERING TWO AUXILIARY NAVIER-STOKES AND TRANSPORT PROBLEMS. RW-IRSSJ [Internet]. 2021 Sep. 19 [cited 2024 May 16];4(2):33-42. Available from: https://www.researchersworld.com/index.php/rworld/article/view/1029