Electron spin resonance of coupled pairs of Cu2+ ions in Pr0.5Dy0.5Ba2Cu3O7−δ and Sm0.5Gd0.5Ba2Cu3O7−δcompounds in the tetragonal phase - Guskos, N.; Triberis, G.P.; Likodimos, W.; Kondos, A.; Koufoudakis, A.; Mitros, C.; Gamari‐Seale, H.; Niarchos, D. (physica status solidi (b), 1991)