Muhammad، H. K. (2009). Comparison of the Total Cross Section of Ionization and Determination the Probability of Ionization for Scattered Positrons to Helium Gas at Energy Range (300-2000ev). مجلة كلية التربية، ع1 ، 714 - 721. مسترجع من http://search.mandumah.com/Record/677791
Muhammad، Haider Kadhim. "Comparison of the Total Cross Section of Ionization and Determination the Probability of Ionization for Scattered Positrons to Helium Gas At Energy Range (300-2000ev)." مجلة كلية التربية ع1 (2009): 714 - 721. مسترجع من http://search.mandumah.com/Record/677791