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PROCESSCHARACTERISTICSOFHoBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub>ANDEFFECTOFMAGNETICFIELDONSUPERCONDUCTIVITYOFREBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub>(RE=Y,Ho)¥Yi,Jianhong;Pe