Nonlinear effects in quantum electrodynamics
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1991 ◽
Vol 51
(3)
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pp. 403-412
2013 ◽
Vol 15
(10)
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pp. 105002
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1966 ◽
Vol 90
(11)
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pp. 435-489
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1968 ◽
Vol 94
(2)
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pp. 359-360
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