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The study of the chemical states of the elements at the surface and bulk phases of high T~c ybcof superconductors by XPS
LIU SHIHONG;ZHANG JINBIAO;GUO KEZHEN;HU YUXIU;XU CUIYING;ZHU DAOBEN
Acta Chimica Sinica . 1993, (
8
): 761 -768 .
