1. Quantum Theory of Scattering;Sunakava,1979
2. Optical Spectra of Atoms;Frish,2010
3. Collisions of Electrons with Atoms and Molecules;Drukarev,1978
4. Electron excitation cross section energy behaviour approximation for helium atom;Mityureva;Opt. Spectr.,1993
5. Approximation of energy dependences of the cross sections for electron excitation of atomic levels of helium from metastable states;Mityureva;Opt. Spectr,1999