The perturbation theory for multiphoton ionization of atoms

Multiphoton Ionization of Atomic Hydrogen Using Perturbation Theory

Theory of Multiphoton Ionization of Atoms

Selection rules for atom multiphoton ionization by intense light in a non-perturbative theory

A Contribution Towards the Theory of Multichannel Multiphoton Ionization of Atoms

Multiphoton ionization of hydrogenic atoms and the breakdown of perturbative calculations at high intensities

On the infinite summation in the theory of atomic multiphoton ionization