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3. Elaf Sabah Abbas, Emad Kuffi, Sarah Faleh Maktoof Al Khozai, Solving an improved heat transmission measuring equation using partial differential equations with variable coefficients, International Journal of Engineering & Technology, Volume 7, Issue 4, 2018, pages 5258–5260.
4. HELM: Help Engineers to Learn Mathematics, “workbook 25: Partial Differential Equations”, http://helm.lboro.ac.uk.
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