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2. The importance of resonances in microwave “ionization” of excited hydrogen atoms
3. Classical theory of the chaotic ionization of highly excited hydrogen atoms
4. Mariani, D.R.; The Ionisation of Hydrogen and Helium Atoms by Static and Microwave ionization of highly excited hydrogen atoms: Experimental and theory, in the physics of phase space, edited by Y. S. Kim and W.W. Zachary; Springer, New York, 1987, pp.106-113.