Ghassan E. Arif1, Samer R. Yassen, Abdulsameeh.F.Abdul Aziz, و Summar.W.Omer. 2020. "Constructing Mathematical Models to Find a Relationship Between Physical Compounds Using the Graph Theory". Tikrit Journal of Pure Science 25 (6):126-29. https://doi.org/10.25130/tjps.v25i6.321.