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2. H. S. W. Massey, E. H. S. Burhop, and H. B. Gilbody,Electronic and Ionic Impact Phenomena(Oxford University, Clarendon, 1971), Vol. III.
3. Transitions among the 3p2P states of sodium induced by collisions with helium
4. Fine-Structure Transitions and Shape Resonances
5. Sodium 2P fine-structure transitions in collisions with helium