Geodesic
Variational principles for the scattering problem in the presence of a strong electromagnetic wave
Teoretičeskaâ i matematičeskaâ fizika, Tome 38 (1979) no. 1, pp. 121-127 
M. Ya. Agre; L. P. Rapoport. Variational principles for the scattering problem in the presence of a strong electromagnetic wave. Teoretičeskaâ i matematičeskaâ fizika, Tome 38 (1979) no. 1, pp. 121-127. http://geodesic.mathdoc.fr/item/TMF_1979_38_1_a11/
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Voir la notice de l'article provenant de la source Math-Net.Ru

A stationary approach to the problem of scattering of a nonrelativistic particle on a potential in the presence of a strong monochromatic electromagnetic wave is formulated in the language of quasienergy states. Functionals that are stationary on exact solutions of the problem are constructed. The variational principle for the scattering amplitude and Schwinger's variational principle are generalized.

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