Sergey V. Laptev, Ali Fadhl Bueawi,. 2019. “The Techniques of Distribute Sources of Financing Long-Term Investments Between the State and Oil-Producing Companies: The Experience of Russia and Iraq”. International Journal of Advanced Science and Technology 28 (13), 253 -65. http://sersc.org/journals/index.php/IJAST/article/view/1309.