Shi De-Heng, Sun Jin-Feng, Zhu Zun-Lüe, Liu Yu-Fang. A modification method of additivity rule for total cross section calculations of electron scattering from molecules considering the geometric shielding effectJ. Acta Physica Sinica, 2008, 57(3): 1632-1639. DOI: 10.7498/aps.57.1632