Doping effects of 3D metal on single-phase YBa2Cu3O7−δ - He, Z. H.; Chen, Z. Y.; Xia, J. S.; Pan, G. Q.; Qian, Y. T.; Zhang, Q. R. (American Institute of Physics (AIP), 1988)
http://dx.doi.org/10.1063/1.341393
Keywords: U