1. Abstracts. Proc. Intern. Conf. Phys. Electron. At. Collisions, 5th, 1967;Afrosimov,1967
2. Abstracts. Proc. Intern. Conf. Phys. Electron. At. Collisions, 5th, 1967;Alam,1967
3. Handbuch der Physik;Allis,1956
4. Radiative charge transfer from He atoms to He2+ions
5. Atomic collision processes. Proc. Intern. Conf. on Phys. Electron. At. Collisions, 3rd, 1964;Amme,1964