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. 2017 May 9;7:46503. doi: 10.1038/srep46503

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Microstructure and morphology of different samples with changing Ce amount (a,b) No. 0; (c,d,e,f and g) No. 2; (h,k,l) No. 3; (m,n,o) No. 4; (p,q,r) No. 5.