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Phys Rev B Condens Matter
; 36(17): 9228-9233, 1987 Dec 15.
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| MEDLINE
| ID: mdl-9942789
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Phys Rev B Condens Matter
; 35(11): 5761-5765, 1987 Apr 15.
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Phys Rev B Condens Matter
; 31(10): 6856-6858, 1985 May 15.
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| ID: mdl-9935587
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Phys Rev B Condens Matter
; 31(4): 2467-2471, 1985 Feb 15.
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