Hassan, Karim H., and Khalid Kh. Hummadi. “Production of Formaldehyde by Catalytic Conversion of Methanol”. Iraqi Journal of Chemical and Petroleum Engineering 5, no. 3 (September 30, 2004): 33–39. Accessed May 17, 2024. https://ijcpe.uobaghdad.edu.iq/index.php/ijcpe/article/view/693.