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Dive into the research topics of 'Oxygen stoichiometry and superconductivity in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub> and Pb<sub>2</sub>Sr<sub>2</sub>Y<sub>1-x</sub>Ca<sub>x</sub>O<sub>8+δ</sub>'. Together they form a unique fingerprint.