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Aihua Wang, Xiaoxia Wang, Yigang Cao, Xinli Li, Yongyong Wang, Liming Gao, Heqiang Lu, Jie Zhang, and Pinglin Li, Ionic cluster effect in suppression on superconductivity in Ni- and Co-doped YBCO systems, Low Temp. Phys. 34, (2008) [Fiz. Nizk. Temp. 34, 219-224, (2008)] DOI: https://doi.org/10.1063/1.2889400.