Comment on “Photoionization of helium atoms irradiated with intense vacuum ultraviolet free-electron laser light. Part I. Experimental study of multiphoton and single-photon processes”
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1988 ◽
Vol 65
(3)
◽
pp. 573-577
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1993 ◽
Vol 331
(1-3)
◽
pp. 117-121
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