Hassan helal abdolah R. Derivation of Composition Formula for Evaluating Triple Integrals Numerically BY Using Trapezoidal rule and Midpoint and when the Singularity at both of End Integrals. JQCM [Internet]. 7Aug.2017 [cited 30Aug.2021];8(2):16-8. Available from: http://www.qu.edu.iq/journalcm/index.php/journalcm/article/view/36