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Phys Rev A Gen Phys
; 37(11): 4269-4279, 1988 Jun 01.
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| ID: mdl-9899553
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Phys Rev A Gen Phys
; 37(11): 4280-4285, 1988 Jun 01.
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in English
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| ID: mdl-9899554
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Phys Rev B Condens Matter
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Phys Rev B Condens Matter
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