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Somasundaram, P and Ram, Mohan A and Umarji, AM and Rao, CNR (1990) Synthesis and characterization of superconducting $YbBa_2Cu_3O_{7-\delta}$ and $Y_{1-x}Lu_xBa_2Cu_3O_{7-\delta}$ (0.0<x<0.75): lower limit of the rare-earth ion radius tolerated in the 123 cuprate system. In: Materials Research Bulletin, 25 (3). pp. 331-335.
