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Phys Rev B Condens Matter
; 40(18): 12499-12502, 1989 Dec 15.
Article
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| MEDLINE
| ID: mdl-9991886
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Phys Rev B Condens Matter
; 39(9): 6231-6233, 1989 Mar 15.
Article
in English
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Phys Rev B Condens Matter
; 33(9): 6512-6514, 1986 May 01.
Article
in English
| MEDLINE
| ID: mdl-9939214