OBSERVATION OF CRYSTAL-CHEMICAL STATE OF EUROPIUM IN SUPERCONDUCTING OXIDE CERAMICS OF THE EU-BA-CU-O SYSTEM BY NUCLEAR GAMMA-RESONANCE TECHNIQUE

B. A. Tallerchik, N. K. Cherezov, A. O. Olesk, R. V. Parfen'ev, S. A. Sattarov, A. V. Perfilov, Y. V. Bobkov

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