Superconductivity of the Y1-xLaxBa2Cu 8Oy system prepared in air B. Chevalier, B. Buffat, G. Demazeau, B. Lloret, J. Etourneau, M. Hervieu, C. Michel, B. Raveau et R. Tournier J. Phys. France, 48 10 (1987) 1619-1622 DOI: 10.1051/jphys:0198700480100161900