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Erratum: Quantum theory of electron lenses based on the Dirac equation
R. Jagannathan
Phys. Rev. A 44, 7856 (1991)
Erratum: Analytic structure of the ac quasienergy in the complex field plane [Phys. Rev. A <i>43</i>, 3764 (1991)]
Marcel Pont and Robin Shakeshaft
Phys. Rev. A 44, 7856 (1991)